If you need a MIDI controller, I'd go with one of the two listed below. They are both highly rated. I have the Evolution and it is works great. If I was going to buy again, though, I'd probably go with the new Roland. Here's some info from their web sites:
Roland PC-70: ($150) 49-full sized velocity sensitive keys with pitch bend, modulation wheel, and LED readout.
The PC-70 has a new sleek design in metallic silver, and is perfect for use with any GM/GS compatible sound module or synthesizer. Includes a power supply, MIDI cable, and sustain pedal
http://edirol.plands.com/shop/prod-gateway.ddp?itemcode=362178
Evolution MK-149: ($110)
The Evolution Music Creator 49 is the number one selling MIDI controller keyboard and software package in the world. Winner of 7 top magazine awards,
the Music Creator 49 is now established as the most popular choice when it comes to PC music making.
The keyboard has 49 full size, touch sensitive keys, pitchbend and modulation wheels, volume slider, program and voice change buttons, memory buttons and a 3 digit LED display. The modulation wheel is assignable to all standard MIDI controllers.
Our number one selling MIDI controller keyboard and software package has everything you need. An impressive keyboard and an incredible software pack which includes the powerful MIDI/Audio sequencer Sound Studio, plus a connecting cable that hooks up to your PC's soundcard which powers the keyboard as well.
http://www.evolution.co.uk/