Im building a low budget gaming pc for my brother, budget is around $600. All hes really going to be doing is homework (word documents), web surfing, said he wants to play Oblivion, Diablo III and Starcraft II when they come out. I was planning on getting him a 550be, but then I saw the AII X4 620 and I'm thinking I might go with that. I read on anand they got theirs up to 3.25ghz on stock cooling and I would imagine I could probably get something similar. So what do you guys think I should get, a higher clocked dual core with more cache, or a lower clocked quad with less cache?