Cream colors (most off whites fall into cream categories) and white/greys don't usually look good together. They make each other look dirty. Get a few pieces of the white marble tiles and get a door sample in your color. Bring them home to your kitchen, for your lighting, and put them next to each other and see what they look like they. If you see color like most people do, you're not going to think they look good together. Get a back splash that's warmer/beige in hue or a completely different color than white. That's just my opinion. Not written in stone.

it's hard to argue with quartzite in general. Gray seems like it will complement very well but I agree with romy, get the doors and slab in the same room and see. I've been bouncing back and forth on my decisions now because of that, which is good to do now.

Someone in the past posted her kitchen using Farrow and Ball Pigeon. I love this green and think it could compliment your floor and granite.

If this were my space i'd spend to fix the microwave situation. the walls are the problem as they have a yellow undertone. I dont see the problem w cabs and counter at all. Paint the walls the aesthetic white shown above. or a neutral bone or ivory or a white w more green undertone. stay away from yellow anything due to the true tan/brown of counter/floor.....Then I'd probably swap the glass in the vertical cabs for a smokey/frosted glass. I dont find the clear glass in that situation a plus at all. I dont see any yellow issue w cabinets from these pics........lighting assessment and a neutral wall color will address what you think is a yellow cast to cabs.....but probably is not. Money saved. Fix the corner w microwave.