I would not want black counter with black appliances.

I like black countertops and the white sounds a great contrast. However I like the quartz that has the least pattern in it (almost uniform black)

Do you do much cooking? Is the kitchen well lighted? I find dark counter top difficult for food prep. Light colors give much better visibility.

Medium toned countertops are my personal preference. I've never had black countertops, but I hear a lot of homeowners that do have it say that it shows everything (dust, crumbs, spots). I must agree that the white cabinets and black countertops are very attractive once it's done.

You definitely need to check out Cambria "Hollinsbrook" black with really neat veining