I´m gonna get a new 27" quad iMac to run Photoshop, Lightroom , Nikon NX2 and evtl. Aperture to work on my photos. I never play games. (Now I have a 24" 2,4 Ghz iMac with 4GB RAM +1,5TB HD) Two questions: Would you suggest the new imac to have 512MB graphics or better 1GB? Would -with the same graphics - an i7 quad CPU be remarkably better than an i5 one? I know, the bars in the charts are a bit longer, but would the surcharge be worth spending? Thanks for sharing you experience and your advice!