Speaking as a person that chose a PSU with double the wattage needed to power my system, I agree that the advice given to the OP, to get a 650 watt PSU, makes perfect sense. The points made about efficiency, and saving money, both on operating and initial costs, are totally valid, and intellectually, would be the right choice.
But a lot of the PSU's I see in people's sig's seem to be overkill. My opinion is that, like people that buy cars with high HP V-8 engines so they can Idle along in rush hour traffic back and forth to work, there is a belief that more power is always better. You can never tell when you'll need it, ha.
I could sort of see by his third or fourth post that the OP was set on more PSU than he needed.
In my own case, I probably suffer some of the same thing, though in my defense I'll say that the negatives of the costs associated with an excessive PSU are minimal to me. Running cost is certainly more than with a properly sized unit, but overall my rig is either turned off, or in sleep mode most of the day. I'm on the netbook for longer periods.
For even greater savings than I'd get with a smaller PSU, I could have just bought a modest $499 rig instead of the one I built, since I could reasonably consider my whole system as overkill.
The real kicker was that when I was first planning my build, I saw the Corsair HX850 for sale (with a discount code) for $139 with free shipping, and if the MIR ever arrives, total cost will end up at $119. I'm not sure I could get a Seasonic X-650 for that. So I get to stroke my ego, and save money at the same time!Edited by denydog - 1/11/11 at 1:31am