OK, so it's finally released. And I need to upgrade my G4 Dual Optical, so I can start using newer applications like Logic Pro, CS4 and maybe something like Maya and Final Cut Pro (at a later date) I just need somebody to Geek me up on the differences between these two? In the UK it seems there's a £600 difference ($844usd/670 euros). So, just in normal terms, for somebody that doesn't know too much, but just enough, I need to know what the difference is between these. I need/want a machine that's going to last me a long time, so what is the difference between Quad-Core or 8-Core, and what will I get for my money? Simple terms, please? (Sorry if this question has been posted before, but I can't find it) P.S. And if somebody could advise a good home or use for my old G4 Dual Optical, you'll get an extra 2000 bonus points.