I don't see many of these, or maybe I'm not looking in the right places. My keyboard is really starting to show its age (complete with squeaky keys), and I'm looking around casually for a replacement. I REALLY like the M-Audio Evolution controller, but it's only 61 keys..which isn't really a problem, except for when it comes to work involving piano or harp. 88 keys is fine, but I really like the size of 76-key controllers. The only problem is that I don't see a lot of them.
Bill: I don't use keyswitching too much.. but the Evolution 61-key controller has buttons that you can assign to any MIDI note.. that means I could assign the buttons to the keyswitches and use those instead (which actually is kinda cooler).
76 note controllers/synths I have known and loved in chronological order:
Yamaha DX-5 (nice feel, no 127 velocity but you get 2 DX-7's in one box)
Yamaha KX-76 (great feel, 2 sliders, dated technology, no 127 velocity)
Roland D-70 (feel is ok, has 4 sliders, interesting synth, small footprint, but keys break too easily)
Yamaha EX-5 (solid feel, has 2 mod wheels, 6 knobs, a ribbon controller, and a breath controller).