This is all for the 21.5inch iMac. ok, first of all, is there any difference between the i3 and i5 apart from that it's faster? Is it really work the £160 for 0.40 GHz? How much difference does it make? Also, what's the difference between the two graphics cards? I admit, I don't know anything about graphics cards. The applications I use are: Adobe Creative Suite, Final Cut, Safari, etc.