Welcome to the safe, sexy, BMW-like world of Apple, halcyon. I've got an Mbox that I run on my iBook G3 (the one before yours) and it is the best investment I've ever made. I've also got a modular synth called Tassman, which like Reaktor, you can theoretically create heaps and heaps of unique instruments and sound generators. And hardly anyone uses it, so you'll sound different....
I've maxed out what my computer can do though, so a new Dual 2Ghz/3Ghz is next sometime this year...
