I began purchasing most of the arcade buttons. i got a combination of standard green, standard black, and chrome illuminated red and green for the start/stops on each channel:
And a joystick controller from the classic pac man style:
Waiting on a few other factors before picking up the UMC32's, and have an outstanding question out to http://www.happ.com/ about how much power is needed for their illuminated pushbuttons.
Now to search for acceptable knobbage....