I just sold me one of those,
because It did not handle the new PT 8 too good.
So...
I'm now running MacPro.
And Its another world, I tell you.
IMO to purchase a G5 today is to walk in the wrong direction.
The future of G5 is fading, and you will work on an 'old' system.
And you're sure gonna experience little support from (almost) every plugin/DAW developer.
They all concentrate on Intel, naturally.
My 2C...
M