A couple of things....first, a vessel would need to be dropped so that it was easy to get to the bottom of it. Realistically, the bowl is probably not going to be deep enough for washing up. Then there is the grunge factor. Water outside the sink can't get pushed into the sink (the main reason for the popularity of undermount and farmhouse styles instead deck mounts). How about two sinks in the kitchen? A veggie vessel and a bigger wash up sink? Best of both worlds?

To add to Ironwoods comments, you'll notice when you buy vessel sinks that most don't come with stoppers. They are so shallow and no overflow drain. Also, as Ironwood mentioned, to sit it on top of your current counter, it will probably be too high.

Thank you for your comments. I don't think I will do a vessel sink now as you raised problems I didn't think of. Would you have any ideas on a "different" type of kitchen sink. When the reno is finished it will be a cabin feeling kitchen with earth tone colours and pine planks on the ceiling, do you have any suggestions? I would like an option that is different but not really expensive. I have seen some sinks for 1500 to 2000 and can't seem to justify spending that much money on a sink?

Research concrete and slate sinks. Both can be rustic and work with your style (I think). I see a farmhouse style working with your earth tones... What wood are your cabinets? Something with character and knots? For information on concrete sinks here on Houzz, look up Twisted Minds Construction. He specializes in concrete and seems very knowledgeable and reasonable (in spite of the name!). for slate, a google search or a custom fabrication is necessary. Most slab fabricators can handle the task. Look up local pros on the "find local pros" button on the header line above. Search you zip code for countertop fabricators and give one a call for a rough estimate. Hope this helps!

Michelle, sounds like the tone of your home is similar to ours. We did a lot of stained knotty alder and cypress throughout the inside and have knotty alder ceilings in our kitchen. Based on that, I'll tell you what I was considering as we were building. Initially I wanted an old refurbished cast iron sink. One with the built in drain board on the side. I also considered a copper sink. Love the look of the aged copper in a cabin style home. Unfortunately, I didn't end up with either, but the run of the mill stainless undermount sink.

Do not do a vessel sink in the kitchen. Save it for a powder room, if you have to put one somewhere. They just aren't practical for the kind of use a kitchen sink gets. You might try looking for older, salvaged cast iron sinks that are still in good condition.

Here's a few photos.
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Here is a slate sink!

Ironwood, thanks for the compliment, (I aquired the name from my approach to design/build projects). Michelle, as far as a vessel sink in kitchen, unless you are 6'-8" or taller, by the time you put an 8" sink on top of a 36" counter you would be very uncomfortable with doing dishes. The farmhouse style sink is a very good choice in a rustic setting, either single or double bowl. One of the beautiful aspects of concrete is it can be molded and designed in ways not practical with others materials. Talk with a local concrete artisan, and bring your ideas and desires, they should be able to design and craft a sink that will be the unique addition to your kitchen you are looking for. I've included a link to a concrete countertops FAQ's page to give you some information to help you decide if concrete may be the choice for you. If you have any follow up questions, feel free to ask. I'd be happy to try to answer.

https://www.houzz.com/discussions/concrete-countertops-faqs-by-twisted-minds-custom-designs-dsvw-vd~346684