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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Thanks to all for the advice above.

I picked up an M-Audio Oxygen 8 and shortly after... Reason. The keyboard came with a demo, but after a few short hours of fooling with it, I had to go for the full version. It's wicked and I now see the advantages over Soundtrack and GarageBand. I'm sure I'll still utilize Soundtrack quite a bit, but I'll spend most my leisure time with Reason. No sense in owning this app without a keyboard either.

We'll see if I outgrow the 32-key keyboard, but for now it's more than enough.