I have just buy a 2010 imac 27" core i3 3,2. I'm thinking change it for a 27 core i5 2.8 quad, but everyone in apple store told me that i will not feel the difference between this two imacs in normal work. I'll work mainly with office, parallels for develop with .net, some ilife (photo and video). what do u think? As an alternative i'm going to put more memory up to 12 GB.