Little light on the graphics card there. I'd of gone with a 6800GT-OC from BFG.. That 6600 is a bit on the lean side for upcoming games. I'd of saved the money, got your other system (which was fine) up and running, and spent the money on a 6800GT for that system instead. Processors mean almost nothing to most games once you get past the 2.4Ghz mark in my experiance, its all about Ram and Graphic card.
Sounds like you needed an oil change, and threw out the car! Doesn't make much sense to me man. You needed a $30 powersupply, so you purchase a new system thats not much better anyway?