I'm looking to add a controller keyboard to my setup. I'm actually at a loss as to what size and features. I don't have many requirements other than I'd like to be able to switch between midi modules/keyboard sounds. Are 25 keys too few? Do I really want 49 keys? I know Edirol makes a 32-note board, but is it worth the extra price?

What kinds of controllers are you using and what are the pro and cons? Happy New Year Everybody!