Yeah...I dunno about that 204W for the Phenom II x4, suggested by the Power Calculator. And the 450W can handle his setup if he doesn't max everything out. The 384W was on the overclocked page of the Anandtech review, btw.
My HDD's are raided, so they get maxed out regularly. I encode DVDs, so that taxes the CPU, HDD, & DVD (if I'm burning another at the same time). And I'll play games or watch movies on my computer while doing it. That'll get me pretty high in the usage and IF he did that, he should use more than a 450W.
I used to use a 285W for a GTS 250 w/ my Athlon x2 5000+. It didn't crash--at least not often. But it wasn't a smart idea. I've had PSU's blow out and break components and my friends have too.
What's wrong with the Antec Earthwatts I listed? I haven't really looked it up, but is the Earthwatts series worse than other Antecs? It's 750W for the same price as the 650 you listed. It's 80+, not 80+ Bronze, but I don't think that's worth getting one 100W smaller. Although that's really only useful if he switches to Sandy Bridge/Ivy Bridge and can SLI that GTX 460.
Btw, when you do upgrade Brandoindiep, look at the New Intels or AMD's Bulldozer. It'll be substantially better in almost every way than a Phenom II x2 and, in some ways, cost competitive. Some of them will be out by early March.