I recently bought a Asus P7P55D Pro Motherboard, and Intel i5 650 to use with my Cooler Master CM 690 Case, Evga 1Gb DDR3 Gtx 285 Graphics Card, Western Digital 320GB SATA, and Kingston 4GB 1333 RAM that i had laying around brand new.. I was going to use my Thermaltake TR2 RX-550 ATX 12v 2.2 Power Supply and old dvd burner out of my older computer. I have 2 questions does this seem like a good build and should I use the old power supply or go out and buy a new one?