Check compatability...most likely it'll work...make sure it has the right connections...presuming your computer is from planet earth...!
I just bought a 600W power supply (up from that damn 350W) off eBay, for $22 (including shipping)...so that's where I suggest buying one...! That one you mentioned would work, if all you plan to power is the main board? ;-) Just bid on a bunch of the cheap auctions on eBay...it's truely amazing 10 days later when you get five or so notices that you won...then take it to school or 'wherever'...and sell the extras ;P Hehe...
-X