Ok, Total Newbie Question About Setup Options

[Killall]

Currently I'm a musician, however how never done any recording or anything computer based at all other than going into the studio and the engineer does his magic while I explain the sound I'm looking for, etc... while I just play. I'm looking to change this via all the greatness I hear around mac in the music world.

My question specifically is around usb-keyboard that i will begin my experimenting with. Looking on the apple site I saw this:
Edirol PCR-30 MIDI Keyboard Controller for $199.00. Is there something better for the price I should be using?

[Killall]

I also forgot to ask, what digital audio interface is recommended? I plan on playing some instruments directly in and using the usb-keyboard for other creation and learning with GarageBand before moving up to more expensive setups.