I work for a advertising agency. We need to upgrade to CS3 but all our machines are Power PCs, no intel machines so hardware upgrades are the discussion of the day. How does the 2.8Ghz iMac compare to the 2.8Ghz quad-core Mac Pro? Is there a $1000 dollars worth of performance difference? Is it foolish to even consider the iMac in a work environment (working in the CS suite allll day)? I'll ask you forgive my tech ignorance ahead of time. Thank you.