Even the latest cards use about 100W.
Please post the full intended specs. Then we can advise on a suitable PSU.
Either of these power supplies would easily run that setup, the 700W GameXStream is recertified but an incredible bargain(i picked one up myself):
http://www.newegg.com/Product/Product.aspx?Item=N82E16817189005
http://www.svc.com/ocz700gxssli-b.html
PCI video cards are generally old and don't consume a lot of power. probably 100 watts each at the most.