@KG - just curious.. which country are you in?ColorsIT are quite popular here in India.. for all the wrong reasons though!
Your config is a decent one, I'd recommend an Antec NeoHE 500. Nothing more powerful is required. It is enough for you.. and will ensure a decent upgrade path as well. I'm running a dual-core system with 2GB RAM, a 7900GTX, 3 HDDs and 2 optical drives on mine. No issues so far.
Q6600@3.1Ghz | Asus P5Q-E | 4GB DDR2-800 | 8800GT | 4TB HDD | Viewsonic vx2025wm
Xonar DX | Pioneer DVR-212 | Pioneer 111L | Benq 1655