Redjake, you have to remember he plans to upgrade with this PSU as well. In that case, 600w known good units are as low as you want to go, because you never know what you may want down the road. Hell he may want a quad core at some point if he does CPU intensive stuff, and the OCZ600 will do the job, while the 430w would die in a week.
Also, current matters on each rail (voltage can be tweaked either by a trim pot on the rail inside the unit, or added on the voltage sense lines if needed), as well as the number of rails. The goal is less +12v rails and more amperage per rail, ideally being 1 rail with a massive amp rating. Not to say that 4 rails is bad, but if I could choose between 4 rails @ 60A total and 1 rail @ 55A, I'd go with 1 rail. That way you have less of a chance of overloading one rail, depending on how they branch (or combine) the rails at output.
If you want to know what a well-planned PSU can do, I have a quad Q6600 2.4GHz overclocked to 3.6GHz (can run 4GHz, but not daily), 2GB Crucial on a Abit IP35 Pro, 8800GT, 10k raptor, 250GB sata drive, several 120mm sanyo denki fans, all watercooled. I ran folding@home for months, dual SMP instances which means full 100% CPU load and heavily taxed memory. The PSU output was a little warm, but not hot. If a 560w PSU can do that, you know you have the right PSU. The great part? The PSU was not an upgrade, it was left over from the system before
. That's why he should get a 600w+ unit, because you never know that the next system will be.