Until the G1000, all my other keyboards used to be 61 keys (except the real piano). Since I don't play from songbooks (all by ear), I did not have a problem with it at the time, but now that I am used to 76 keys, it will be really hard to go back - longer keyboard makes it practical to split right hand into two zones (and still have enough keys for each to play). It has also altered my playing style a bit - I find myself playing playing many disco-type songs with the piano-style left hand, and a dance piano layered over it, so that I can add extra variety to the accompaniment section.

At the same time, I like having the built-in speakers. My pet peeve with the current crop of the speakered keyboards is that most high-end instruments have such a long chassis (with space wasted on either side of the 61 keys) that it should be trivial to add another few keys on each side. And, BTW, I don't care about the modulation wheel and pitch bend, these function may easily be assigned to an aftertouch. Alternately, it may be useful to re-create the design Yamaha used about 10 years ago, to add roll-bars in front and below the keyboard, so that you can rotate them with your thumb without taking the rest of the fingers from the keyboard.

Regards,
Alex