49 velocity-sensitive keys, USB powered, and even comes with a version of Reason - not bad for $99! Worked immediately with Garageband 2, too.
I'm not promising I'll be turning out anything listenable, though. ^_^
Edit: seems M-Audio's running a promo until the end of December - buy one of their keyboards, get three Reason ReFill packs free! But which to go for? The selection is:
Sonic ReFill Vol. 1: Synths 1
Sonic ReFill Vol. 2: Synths 2
Sonic ReFill Vol. 3: Rhythm Section
Sonic ReFill Vol. 4: Pianos and Organs
Sonic ReFill Vol. 5: Symphonic
Sonic ReFill Vol. 6: OmniSoundz GM
Sonic ReFill Vol. 7: Reality Drums
Sonic ReFill Vol. 8: Monster Drums
Sonic ReFill Vol. 9: Vintage Drums
Sonic ReFill Vol. 10: Instruments of the 60s-70s
Sonic ReFill Vol. 11: Retro Keys
Sonic ReFill Vol. 12: Acoustic Folk
Sonic ReFill Vol. 13: World Percussion
Sonic ReFill Vol. 14: Ethnic Instruments
Sonic ReFill Vol. 15: Film Orchestra