Trying to decide between a 2012 iMac or Mac Mini. The two systems I'm looking at would be: 2012 27" iMac (refurb) i7 3.4ghz 8gb RAM (upgrade myself) 1tb fusion 2gb gtx 680mx or 2012 Mac Mini + refurb TB Display i7 2.3ghz 4gb RAM (upgrade myself) 256 SSD Intel 4000 HD Graphics My primary uses would be photo editing (lightroom and photoshop), some handbrake transcoding, and general web surfing. I do not play games. Is it worth the price difference to go with the iMac? Will the better graphics card really make any difference with my uses?