I was thiking of getting this Evercase w/300W Enhance PSU for a system I'm building for my little sister. She likes to play games (not just The Sims, but Unreal too ). I'm planning to get a P4 2.4 533, 512MB PC3200 ram, and a GeForce Ti4200. Would the 300W PSU be good enough to run these? What if I want to overclock? (I'm thinking not). Any suggestions are appreciated; I'm trying to get a cheaper case/psu since I'm blowing the bank on the system.