Cooling/PSU help

[RandomCL]

I have my system all picked out and ready to order but I'm unsure on how much cooling I'll need, if stock cooling will be enough, etc., and how much power I will need. Here's a brief synopsis of the system:

7900GS, 1GB PC3200, X2 3800+, 160GB HD

Basic build, obviously. Here's the case:

http://www.newegg.com/Product/Product.asp?Item=N82E16811145047

Ugly as sin but it isn't going to be visible most of the time; I just need a cheap one that'll fit my needs. It comes with a single 80mm fan, but I was unsure if I need more (I have 3 or 4 extra). Also, what PSU will I need? I had one picked out:

http://xoxide.com/casegears-black-steel-480w.html

But I'm unsure if what I have will work. I have a 400w PSU but don't think it'll be enough based on the system a friend used it for and it barely made the cut; unsure on brand and such.

My main question is on the cooling, not so much the PSU. I just don't much knowledge on cooling and was unsure if I needed more than the case has.

 

[Trotter]

The case only comes with the side fan, but has places for other fans:

FAN SPACE (Front/Rear) 2X80mm/2x80mm

I'd get four good but quiet 80mm fans to add in to it when I built it.

Um... $19 bucks for a power supply? What you been smokin'? Look for Fortron (FSP), SeaSonic, Antec, or such. While cutting cost with the PSU sounds good, you're actually shooting yourself in the foot because a cheap PSU will crap out on you... and take some, if not all, of your components with it.

 

[RandomCL]

The PSU is the same a friend has used for a year in a 4200+ X2, 7900GT, and 2GB PC3200. I think it'll be fine. Thanks for the answers on the cooling, though.

 

[Phrantic]

I wouldn't go by one experience really. Look around for reviews on the internet. I don't know if you will find bad reviews, but I expect you will.