"What computer tools do you use?"
My first sequencer was built into my Ensoniq ESQ-1. 8-tracks and basic 8-button menu driven interface. I could put stuff together really fast with that. Still have it but I want more control so I purchased Vision, then upgraded to Studio Vision (added digital recording). Most of my stuff is in Vision file format and Opcode was purchased and killed by Gibson. I'm going to start out with GarageBand, but I'm considering the competitive 1/2 price upgrade to MOTU Performer. Its pretty cool of them to take a competitive upgrade from a dead product.
I also need a new midi interface - old one was based on serial ports and there are no serial ports anymore. I'm looking at the 828mkII. I have 6 keyboards, 2 drum boxes, a rack D-50, guitar, and vocal mike. The 828 will let me get away with not buying a dedicated mixing board for all that stuff. I'm going to start with the 828 and GarageBand and see how it goes - I suspect I'll need to add additional midi interface more or less right away and we'll see if I can be productive with GB.