White would look best with the floor you choose. I agree with Boswell.

I love the cognac color - it's different. That being said I think the white goes best with the flooring you're considering.

I agree with everyone--the wood flooring would look best with white cabinets. But if you want stained wood cabinets, I like the cognac much better. A slate floor would look great with the cognac color, but it's a much different look.

Wood cabinet with a wood floor is also fine. If you wanted stain cabinets, do not let the wood floor keep you from having them. Do a photo search on Houzz of "wood cabinets wood floors" and many lovely examples will come up. However, do think about how many cabinets you really need. Sometimes people get caught up in thinking they need more storage than they really do, especially if you have a nice pantry, and end up with too much wood because of wall to wall cabinets - you can even get too much white that way, but less likely with the wood floor.

Consider getting your cabinets without the flare on top.