I've come across a rather good deal for a used mid 2011 27" iMac. These are the specs : http://www.everymac.com/systems/app...inch-aluminum-mid-2011-thunderbolt-specs.html I now have a 24" early 2.8 C2D iMac with ATI Radeon HD 2600Pro graphics. It goes without saying that the Radeon HD 6770M in the 27" iMac thrashes my 2600. However, as this is a 27" iMac, I would be playing games at a much higer resolution (2560x1440 vs 1920x1200 on my current iMac). So how good is it at native res ?