For years I used a Yamaha 9000 Pro with the AP and DX cards MIDI'd to a Radio Shack piano (Casio CDP-100 clone used as silent 88-note weighted-action controller). That worked very well and I still have that setup in my studio, but lately I use a Kawai ES4 piano for solo work and a Hammond SK2 for band work. The SK2 acts like a dual keyboard rig: AP/EP on bottom and organ on top. Even though my SK2 "piano" has unweighted action the trade off of having a simple and quick one-keyboard band setup versus carrying around two keyboards won me over.

My arrangers (9000 Pro, Tyros 3 and Microarranger) stay home now. I use an iPad for backing tracks on stage when needed.