I'm trying to decide if the extra $50 to get the 1200 over the 900 is worth paying. I'll have a Q9550 cooled by an OCZ Vendetta 2, a BFG GTX-280, and will eventually have 2 or 3 hard drives and 2 external drives. I plan on overclocking fairly aggressively. I know the 1200 is "roomier", but...