Paint much larger samples on each wall in the kitchen to really see how they look.

I like the darker blue-gray, but make sure that the color compliments your floors, and it may be a good idea to paint a much larger sample. Be sure to paint a sample lower on the wall to see the color next to the floor tiles. We renovated our kitchen last year, and the backsplash doesn't compliment the beige floors, so now we have to change the floors. Ugh! You've done a nice job so far. Good luck!