Hi there, im planning on building an entry level computer for a friend. I'm planning on using an H61 motheroard, Pentium 4 G2030 CPU, 500 GB 7200 RPM hard drive, 2 GB RAM and a standard dvd writer. My problem is finding the right PSU for the build. Will a 450 W be sufficient? or should i look at a 500-550 W PSU?? keep in mind that it's a udget build for an elderly woman, looking to use it for browsing and microsoft word etc. thank you