I've got:
Korg M1R
Korg Triton-Rack
Yamaha DX7
Yamaha FB-01
Roland TD6
Roland M-DC1
Cubase comes with a lot of software synths, but I mainly use the hardware Korgs and the TD6. I use the DX7 as a Midi Controller, but I like the E-Piano in it. Distorted guitars are generally naff in every synth I've got, but clean guitars are usable for me, and the TD6 has a pretty decent nylon string, but obviously compared to the 'real thing' they sound to processed and too clean. The FB-01 and DX7 are old synths, but a lot of fun to play with.
I need a decent keyboard for the Live-Room but I'm not sure which one to get, or whether to just get a really decent controller keyboard for the live-room, and just buy a new rack-mount or software synth. I prefer rack mount synths rather than the keyboard versions, but I guess having all the synths in the control room would make them less accessible to clients, whereas having a keyboard/workstation in the live-room would make it easier for people to flick through sounds on their own.
Not sure how to get midi from live-room to control room. I was gonna just use midi cables, but they make wireless midi systems now, so might try that. Wireless always makes me nervous though regarding reliability.