Hi!

I'm getting into music creation for a while now, and i decided to go a step further and spend some money.
Till now, i was playing with reason, rewiring it to dp4 (with mach5). I have powerbook g4 1,25ghz, a m-audio firewire410, a midi synth, m-audio studiophile bx4 with subwoofer.
I'm thinking about getting a g5. In fact i'm gonna get it for sure.
So what i'm missing i guess, is a mixer and a controler.
I was thinking to get the yamaha 01x, but heard it has some compatibility problem with dp4.
1. But then, what should i do with my m-audio firewire410. Can i still make a use of it?
2a. Is the audio card better in the yamaha 01x?
2b. Is the yamaha01x or other controler controling the vst, audio unit…?
3. Are there different alternativ to the yamaha01x? Mackie…
4. what would you get?
5. what more am i missing in my "studio" to make it kind of complete?

Thank's a lot for your answer.