I just bought a new 4U Intellijel case to make a control case for the rest of my set-up: sequencers, attenuverters, and the SSSR Wobbla (4 units) looks pretty tasty.

It's difficult to critique the system because it seems like everything is covered and it's a question of personal taste. As far as control units and since you play (rather than make weird noises), have you considered something like a Waldorf case/keyboard unit?