Looks prett good from my standpoint, all things considered. I would definately go wit a Memory upgrade as soon as the budget allows as well as the Hdd. As for the PSU, it is not so much the Wattage of the PSU ( In this case 450w ), but what you have on the +12v Rails. The Nvidia 9800GT I have in my eMachines, requires a minimum of 400w w/ 18a on the +12v Rail. I had that with Antec Basiq 500w PSU I had in there. When the gaming got intensive, the 18a wasn't quite enough and had to cut back on the game settings a bit. I changed the PSU out to a Corsair 650w PSU that had 52a on the rail. I haven't checked out the specs on that 5770, but I would imagine it take some juice on the rails ( I also think it takes two PCIe 6 pin connections ). That Phenom II x4 Black 965 is a nice processor. As the budget allows, a few addtional tweaks here and there you'll be in real good shape, but not bad now.