This really looks great! I agree about not using the black. The amber ones look very good. It's a close thing between the white and the amber. That said, I have had once pulled the entire shaft out of pot trying to get the knob off. That's one of the reasons I try to use only solid shaft pots and knobs with set screws. Unless you're unhappy with the amber knobs I'd leave them.
It can be confusing picking knobs. Part of it is there is no one way to talk about them... "fine spline," "USA spline," "CTS spline," and "24 spline" all mean the same thing. "Course spline," "18 spline," and "Asian spline" all mean the same thing too. Anything with a set screw, is, of course, for a solid shaft, although I like set screw knobs so much better that I have some inserts to use with splined pots to adapt them for solid shaft knobs. There are also knobs that have a soft enough insert to take either kind of splines... You might get away with putting a fine spline knob on an asian pot, but the other way around will generally not work. I have a broken knob to prove it.