hi.

I'm not sure what you mean with "5(3) buttons and 1 knob". Hopefully, you don't mean 5(3) different colors for the buttons but only one color for the knob. That would probably look silly in most combinations. Please include a full set of 4 buttons and 1 knob for each color.
For the colors to be ordered most likely, I would guess at
- green
- blue
- red
- amber
- smoke
I would tend to a pretty dark smoke one myself, but others may have different tastes.

cu,
sven