The Terpstra MIDI keyboard has 280 keys, which is a lot. You can set each key to whatever the hell you want, and all are velocity sensitive. The keys can be removed and swapped as well, in case the factory default pattern just doesn't do it for you. The unit has jacks for a foot switch, volume pedal, and MIDI in/out. I couldn't find a price, but it's probably expensive. I need one though because I'm a musical prodigy. My specialty is the Jaws theme. I've almost got that one down pat.
Terpstra MIDI Keyboard - Needs More Keys [ohgizmo]