Need to upgrade a G5 PowerMac in the office with a refurbished Mac Pro and would like it to be at least as fast/powerful as the 27" iMac w/ 2.93 Quad Core i7 processor and ATI 5750 1GB video card that we also have. Price is an issue so the ones we're considering are... 1. Refurbished Mac Pro 2.66GHz Quad-Core Intel Xeon GT120 512MB Video $2039 2. Refurbished Mac Pro 2.8GHz Quad-Core Intel Xeon HD5770 1GB Video $2119 3. Refurbished Mac Pro 2.26GHz 8-Core Intel Xeon GT120 512MB Video $2699 (The price is getting up there on this one but it does have 6GB of RAM whereas the other two only have 3GB and would need to be upgraded) Ideally #2 sounds good to me but I don't know how the 2.8GHz Xeon processor compares to the 2.93 i7 processor. I would assume the video card is better since it looks like a higher model (5770 vs 5750).