Hay hay hay!

I have yet another 'getting started' question that I hope someone can help me out with....

I've been using an MPC2000, 1200's turntables, and a MIDI capable keyboard for the last few years....dumping it all onto a cassete tape for safe keeping!!??

I've finally decided to get serious about the quality of the music I am making and my ability to record it. (and i can finally afford to upgrade my gear a bit)

I have an out of the box Powerbook G4 (1GHZ, 60HD), and I want to keep as much of my existing setup as possible - but be able to record onto my hard drive/burn to CD.

I know that the choices are plenty...does anyone have any advice about what the best route would be while using the MPC as a launching pad?? While I'd still like to use the MPC as my main sequencer/sampler, I'd like to have enough room to grow with my software and interface where I'll be able to record instruments, vocals, etc.

Any information would be appreciated. Thanks much,

Krs