There is a gentlemen offering a mac pro 2.66 (Dual Dual Core), 2gb RAM, 250, 500 gb Hard disks, ATI Radeon X1900 graphics, Dell 24" monitor and Klipsch Pro Audio 5.1 speakers for $1,000. I've been looking at the 20" and 24 inch previous gen iMacs. Either one sounds good, but I have a few questions: 1. I am using this for some light video editing, storing and editing pictures, web surfing, ect. Nothing heavy, just something more powerful than my current Air. 2. I've seen conflicting reports that the 1st Gen Mac Pro's processors can be swapped. I see that the processors are around $500 each. Is it possible though? 3. In terms of raw speed, which one would be better? The iMacs are the 2.66 and 2.8 ghz models. I like the upgradability of the Mac Pro, but the age concerns me. The iMac is my top choice at the moment, but for $1,000, what would you do?