When mixing finishes, you have to look at the plan and see if it makes visual sense. You have a plan, but it's hard to say if it is "too busy" without seeing everything -- the pulls and the layout in particular. You are putting the cool metal finish on the warm wood and the warm metal on the cool finish. That is higher contrast and will produce a busy feeling more quickly than the opposite combination. Have you tried the copper with the oak (may or may not work, depending onthe tones in both)?

The oak will be gone - all white cabs.

Ahh. Didn't get that the white were a replacement for the oak. If you like the copper against the white, I would try them. They will personalize your kitchen. When you look at photos, they will be closer to ORB, aged brass, but not as harsh as black or iron pulls. Make sure you like that contrast when you see it in the whole kitchen. If that look feels busy to you, you might be happier with a silver tone and letting the pot rack and other copper pieces be accessories rather than trying to tie them together. That's okay too. That might be the look I would prefer, but really hard to say without seeing it.