Hmm. My initial thought is to keep them all the same. You already have variation with the different cabinet colors.

But depending what your island looks like - if it's more of a furniture style then maybe it would look good, to have it be it's own piece - but at that point I would almost change the hardware style completely.

It really depends on your style. Get a few of them and see what you think with them installed.

Sure it would look okay. My question is Why? Why do you have to use two different hardware metals when they are so closely related to each other? Or is this something you want to do? I ask because it might be nice to have them the same with same because brushed and polished are very close. By polished do you mean CHrome? I would probably not mix chrome and brushed because it would look like it was a mistake. When you mix metals making a bold mix says you wanted it that way. But I am not an expert, there are many who will chime in with far better ideas. When looking at Houzz images I do see a mix of gold or black or stainless mixed together. I have not seen chrome and brushed nickel. I am sure there is one out there just need to find it. I am sure you can do it. And it will probably look nice.

Well one is shiny and one is Matt and rushed