Keyboard For Soundtrack / Gargageband?, Best one for novice? Options

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I've been using Soundtrack for some time, will probably add GarageBand to the mix, and I want to expand the possibilities with an inexpensive ($200 or less) keyboard. Apple recommends two keyboards on the GarageBand page, so I'm currently looking in that direction, but I don't know if these or others are best for me.

They are:

1) M-Audio Keystation 49e USB Midi Keyboard ($79)
2) Edirol PCR-30 MIDI Keyboard Controller ($169)

About them:

- One has 49 keys while the other has 32 (does that matter to me?)
- One is titled a 'controller' while the other is not (whatever that means)
- One has more nobs and buttons than the other (but maybe these are not necessary and effects can be handled via software...?)

About me:

- I don't necessarily need/want to learn to play piano, just want to be able to create new melodies and loops.
- I played drums for six years so I have rhythm.
- I'm a music nut and know what sounds good.

Any recommendations? It's more a hobby, but partially for business.

Thanks ahead of time!

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Yea... I know Soundtrack doesn't provide any MIDI control and I'm just now figuring out what GarageBand has to offer. I'm anticipating/guessing/hoping Apple integrates software intruments into the next version of Soundtrack. Meanwhile, I was thinking of using a keyboard for creating loops in GarageBand then saving as Apple Loops for use in Soundtrack. I've also looked into Reason, but it seems so complicated compared to the Apple software.

No matter what software I end up using most, a simple keyboard will come in handy for creating unique loops and leads. I also use Peak, so I can slice and dice sounds for use elsewhere.

What do you think? Is Reason worth the $$ and learning curve? Will I be able to get very far with just GB, ST and Peak? Should I go with a larger keyboard? With all this new software and tons of sounds to manipulate, I feel like a chef in a kitchen.