That's kinda funny that Corsair and Mushkin are making PSU's. I have a Mushkin 550w. VERY solid and oh so pretty. The mirror finish and green light is cool. Haven't looked into Corsair yet, but I assume that they would be very good PSU's.
I stand by what I wrote earlier though. The future is gonna require more power. By the future I mean if you want to get a PSU that will be upgrade friendly... ie: 2 vid cards, more ram, more hard drives etc. you will want to get 850w or better. You see if $ is a concern then that's one thing-end of story, but if you want good clean reliable power even @450w you'll need to spend a little more. The catch is that you could spend 80$ on 450w now, but if you spend 30-50$ more "now", you'll be happy in the future. It happened to me. I wanted good power NOW, but I wish I'd have spent a little more and bought the 700w or 850w. I can't upgrade to 2 vid cards or a better CPU with just 550w. I spent $110.00 on 550w which is more than enough for what I have. BUT like I said IF I wanted to upgrade what would I do with my $110.00 550w PSU??? I could have spent an extra $30 and got a GOOD 850w PSU. I wish I would have known that Tom's forums were so helpful. I want to help where I can now. I have been building gaming rigs for 8 years now and have a good bit of knowledge and have done research... daily since 2000. I love this stuff. I was programming in basic on a Commodore 16, then Commodore 64 back in the dark ages and I know what goes into the games of today IT'S SOOOOOOOO cool. BLAH BLAH BLAH... good luck with whatever you get.