I've scaled down quite a bit and now use lots of sound modules to conserve space but my studio is still fairly cramped. My current setup consists of:

(1) AKAI S1000KB Sampler, fully expanded
(2) AKAI S1000 Rack Samplers, fully expanded
(1) AKAI MPC3000 Drum Sampler
(2) Fairlight CMI Series III Samplers
(1) Fairlight CMI/MFX-2 Sampler & Digital Recorder
(1) Forat F9000 Drum Sampler
(1) Forat F-16 Drum Sampler
(1) Korg Triton Rack that's fully expanded
(1) PPG Wave 2.2 with Waveterm A
(2) Roland JD990's with sound expansion cards installed
(1) Roland XV5080 with SRX Piano and SRX String sound boards installed
(1) Sequential Prophet VS Keyboard
(2) Sequential Prophet VS Racks
(1) Sequential Studio 440 Sampler
(1) Technics SX-KN5000
(1) Ancient Wurlitzer Organ with Leslie Speaker
(1) Casio VL-1 (This is what started it all!)

The Fairlight CMI's are the heart of my studio with the Sequential Prophet VS's running a close second. Drums and percussion play a large part in my sound which is why I utilize so many samplers and drum machines (have drums will travel). I rarely buy new gear as I don't find much of the newer keyboards and sound modules to be worth the cost for what they provide. The Triton and XV5080 were the exception as I find them to be quite useful. In my studio space is at a premium so the unit had better be damned good or it doesn't stay in my rig. Now if only some manufacturer would make an all in one portable keyboard that could replace everything I am using that would be great!