I just spent a remarkably frustrating and boring week researching this very topic.

Here is a link that might be useful: Little Gourmet point-of-use faucets

If you really want a dedicated filter faucet, there are a number of models sold by Mountain Plumbing (links below). In my kitchen, these models would not match other hardware well, and their handles would be on the wrong side (there is no mention that the faucets rotate).
I finally called Hansgrohe tech support in Georgia and asked if there was a way to plug up one side of a single-lever mixing faucet, so it could be used with cold water only. I was told that the plumber should split the cold water line going to the filter faucet into two lines, and attach one to the cold input and one to the hot. The result will be that the left-to-right position of the faucet handle will not affect the water temperature. Clearly, this costs more than using a relatively cheap dedicated filter faucet, but all it takes is one turkey design to ruin the overall look.
I hardly ever use unfiltered water in my kitchen, and the location of the dedicated filter faucet is a bit inconvenient, so I am considering running the filtered water to the cold side of the regular faucet, and the unfiltered cold water to the dedicated filter faucet.
You can spend forever reading conflicting claims about water filters. Since I now have three streams of water going toward the ceiling when I turn on my water, and need to get this fixed promptly, I concluded that if Everpure water filters are good enough for Walt Disney World, the United States Navy, and Air Force One, they might meet my needs. I ordered an Everpure system from www.freshwatersystems.com. I hope to get it installed next week.

You are welcome.

I apologize for the confusing wording of my posting. If I do as I am now planning, I will use a regular single-lever mixing faucet for the unfiltered cold water, with one other mixing faucet used for hot water and filtered cold water. The mixing faucet that will have the unfiltered cold water will have cold water running to both its hot and cold inputs, so the temperature will always be that of the cold water. The other mixing faucet will work normally, mixing the filtered cold water with unfiltered hot water. That would ordinarily be wasteful (because filtered water costs more money), but I rarely mix hot and cold water in my kitchen. Most of the time, I am using either hot water, or filtered cold water.

The Mountain Plumbing faucets were brought to my attention by a friend who does high-end kitchen renovations.

I have an Everpure system and used the Mountain Plumbing MT600 faucet. It is great. Looks great and works great. You can rotate the faucet so the handle is on the LEFT but then the throw is backwards rather than forwards. I did this and found I was accidently knocking the handle back and turning the faucet on. I changed it back to the RIGHT so that to turn it on you have to pull it fowards.

Good luck!

Here is a link that might be useful: Mountain Plumbing Faucet

Thanks for the details about the Mountain Plumbing MT600.

I needed the faucet handle for the additional faucet to be on the top or left, and I have very little room on the sink deck before the backsplash (original porcelain over cast iron sink from 1950, still in amazing condition with no damage except a few tiny dings on the edges that do not go all the way down to the cast iron). So I decided to get a mixer with the handle on top.

I and many of my friends have been using Multipure undersink filters--literally for decades--and are very happy with them. My current one has the typical skinny gooseneck faucet with sliding lever that came with the filter. For my new kitchen I spent countless hours trying to find a nicer faucet that would match the main sink faucet, but there's not much out there. I finally settled on a faucet set by Gessi, an Italian maker that has just recently become available in the U.S. They are in the same price range as Hansgrohe, so they are not exactly cheap, but they are really beautiful. Their Oxygene line has a cold water faucet that matches the main faucet, only in a smaller size. I also liked the model because it is somewhat smaller than your average gooseneck type faucet, so it fit in my tiny NYC kitchen.
Waterstone also makes several models that have matching main and cold water faucets.

Thanks. I had not heard of Gessi. Their US Website shows only bathroom products at the moment, but the designs are certainly attractive. Their US office is in Anaheim.

Here is a link that might be useful: Gessi US Website

Inox, I think most of the Gessi products on their Italian website, where you can see the kitchen stuff, may also be available in the U.S. I forgot to mention that one reason I went with them was that like you I had minimum clearance between sink and backsplash. Many of the single lever faucets that have the lever on the side have the lever rotating in a full 180 degree arc, so there's that problem of the lever hitting the backsplash when you move it to cold. On the Gessi model it only moves from the top to the front. I don't know why all manufacturers don't do it this way. Or for that matter, make filter faucets to match their lines!

came with the water softener; had it for 9 years. Came with a chrome one. I just went to LOWES and bought a pretty faucet to match my brushed nickel. Works great and we love it.

Trish

A US dealer for one European faucet maker told me they do not make filter faucets because the water in their country does not require additional filtration beyond what the city provides.

Wow, I don't know how I missed this post, but found it doing a search on water filtration. I have been trying to sort this out for a while. I think I've decided to go with everpure filtration. I need to research the faucet recommendations because I have the same issue of handle hitting backsplash. Is anyone using a water chiller under their sink (or a hot/cold) for their filtered water. I really wanted to have the option of having cold filtered water at my sink. I have had a hard time researching water chillers. I've heard they can be noisy? When I talk to my local appliance place (that sells them) they just look at me like I have three heads. I get the feeling they don't sell many of them. We purchased our fridge without cold water option, because it always made such a mess, but we really want to have good quality cold water without all the plastic bottles. Any suggestions or thoughts would be appreciated.

Aquapure is one of the leaders in this type of under-sink water filtration. We will likely be selecting one of their products for use under our prep sink. They have dedicated dispenser faucets for drinking water only, as well as general filtration if you want to link it to your sink faucet and filter all of it. (You can get a much higher degree of filtration if you have a separate slow-flow drinking water dispenser since you don't need as many gallons per minute filtered through a dedicated dispenser.)

Here is a link that might be useful: Our bungalow remodel blog