Hi, I am looking to buy my first iMac. The refurbished deal on old 27" iMac seems very tempting but want to get some expert opinions before I go ahead an make my purchase. I am holding my purchase for iPod promotion deal with 27" iMac (Higher end). Could you please advice me which of the following two models works best for me (or offer best value for money). OK, question . . . I'm looking to get a 27" iMac. The "older" models are on sale and come equipped with a video card with twice as much ram. So I'm wondering, which of these will "appear" to be faster? 2.93GHz Core i7 Quad-Core (Refurbished) Last years model 4GB (2x2GB) RAM 1TB 7200rpm Hard Drive ATI Radeon HD 5750 1GB Graphics Price $1569 3.1GHz Intel Core i5 Quad-Core 4GB (2x2GB) RAM 1TB 7200rpm Hard Drive AMD Radeon HD 6970M 2GB GPU Price $2099 - $100 (student discount) - $200 (for iPod sale) = $1799 I am planning to use it mostly for Photoshop, lightroom, HDR work, and some time after effects. Am I going to notice any difference in performance between these two?