I have a rough idea looking at eBay, but I wanted a second opinion. 2006 Mac Pro 2.66, 12 gigs of ram, 300gb hard drive, and Ati 5770 video card. 2008 Mac pro 8 core 3.2, 2 gigs of ram, 750gb hd, and nvidia 6600 card. (something like that) My guess: $800 on the 2006, and 1000 on the 2008. Either too high or low?