Is it a all new built or an upgrade?
For your budget you could get this one
http://www.ncix.com/products/index.p...acture=CORSAIR. If you get it price matched with direct canada, you will save another 17$. It's a real good PSU for the price, you will have the opportunity to overclock if you want and it gor 4 pcie connectors for your graphic cards.
But if it is a new built and you don't already have the video cards and the motherboard in hand, I would recommend you to look to something else.
Edit : if the 8800gt have only 1 connector per card, the 650W model could also be enough and the 620w proposed by 3.0Charlie is a great choice to if you would like to go with modular PSU.