Need Some Advice On A PSU

I know this question has been asked a lot so please forgive me. I’m building a new rig and the only thing I haven’t decided on is the PSU. I know the PSU is one of the most important things so that’s why I’m asking for some advice.

Right now my rig will have a
C2D E6600
Asus P5NE-SLI 650i
2GB kit DDR2-800 of Crucial Technology Ballistix BL2KIT12864AA804
eVGA 8800GTX
1 300GB 7200RPM IDE hard drive
1 160GB SATA hard drive
1 DVD-RW/DVD+RW
Sound Blaster Audigy Pro sound card
Font bay fan controller
4 80mm fans.

I used the extreme power supply calculator and even at 100% Power Supply Utilization it only said I need a PSU that was 403 watts. This didn’t seem right, I don’t know if I’m doing something wrong or not. I thought that I would need at least a 600W PSU, no more then 700W, so it seemed that 650W would be just right.

Someone recommend to me to get a Corsair HX620. The reviews for it on newegg were all 100% and sounded like a good PSU and the fact that Seasonic makes it isn't bad either. What do you guys think/recommend and can you give me some good named brand PSU companies to choose from. I’ve heard OCZ, Thermaltake, PC Power & Cooling, Antec, Seasonic are good ones, but I’m not sure. Thanks for the advice in advanced.