If money is hypothetically not an issue, why not put together a software based setup. Get a laptop, USB or firewire audio/MIDI interface, and a nice controller keyboard. There are plenty of easy to use software Audio/MIDI sequencers for cheap money, and virtually unlimited software synths and effects (1000's of which won't cost a red cent). An easily portable setup, which could serve as the centerpiece for either studio or stage, and it would all cost about the price of good synth, with more flexibilty, and better expandibility. If you are set on hardware, look at the Triton Studio.