Audio Interface For G4 Options

[macmusicpd]

I'm getting a great deal on a friend's G4. So I'll be saying goodbye to my G3 iMac. It's time for me to finally get the audio digital interface in order. And I'll be getting a new sequencer program to go with it.

The most I want to spend is $449 for the Mbox package. I've been using Pro Tools Free, so that seems to be a natural choice. But I just got the new Sweetwater catalog and there are a few new things, the Mackie Spike and another interface and software bundle by that reverb maker (I forgot the name, eek).

Does anybody have suggestions about what package would be best for my new G4?

Thanks!