Hi, I currently have a PC and an Apple 20" (1680 x 1050) LCD monitor. I am considering going back to the Mac. I will most likely be buying refurb. I am torn between the following: 21.5" 3.2ghz i3 w/ 5670 512mb and 20" Apple LCD vs. 27" 3.2ghz i3 w/ 5670 512mb and sell the 20" (dont have room for both) I want to use the system for iMovie, XCode, and World of Warcraft. Any thoughts?