Hi all. I want to upgrade my GT5228 Desktop Computer for the new expansion pack for World of Warcraft that is coming out. The game already runs bad at low settings max 8-10 FPS in crowded areas. I want to upgrade the Graphics Card and get a new PSU also expand my RAMM to 4 gigs. My issue is I am unfamiliar with computer hardware and can use some advice. I am frightened at the thought of replacing the PSU as I think my PC will be ruined. But I will have too. So if anyone has suggestions on compatible PSU and a good graphics card, it will be greatly appreciated. Also is the process in installing PSU long alongside the video card? I hope it is not more than 3 hours. My budget is about 250ish give or take.