Taylor: have you ever worked with a Buchla 200e? It's very feature dense, in that you can get a lot of functionality in a small package, and the fact that you have some preset capability makes it much more viable for performance, in my opinion, than most other systems.
+1 for buchla. i had three get-together with buchla systems, and especially when i first had the opportunity to play it for some hours, it was a remarkable experience. especially the 250e sequencer captured me. buchla never got me by it's sound (which by no means is bad, it's just not what fascinates me), but rather it's the feature-density and opportunities.
similarly i was fascinated by the serge system i could hear earlier this year. the simplicity of the modules and the sound (the resonant equalizer is great) are inspiring.
the only other system that fascinated me in a comparable way was the roland system 100m. conservative, nothing unusual, but the sound!
too bad that all these three systems are so expensive ;-)