Thanks so much guys, that calculator was fun to play with, not sure I entered it all in right though.
@neon Yea I was browsing this forum on power supplies looking for some help without posting, and I didn't see a soul recommend this brand..... I'll look into getting an Antec, they seem to be highly praised.
You don't really need a calculator. The page I linked you to does it for you. 2 x 6870s need a 600w power supply. If they are heavily overclocked ( and your CPU too ) make it 700 watts. Stick with the brands I listed for a quality unit.
Where are you buying from? I will be glad to see if anything good is on sale.