What eyefinity video card(s) should I get?

I want to run 4 monitors as one large desktop on Windows 7 and probably will have none with Displayports. If I got 2 eyefinity cards would that do the trick? (In order to run 3 monitors from one eyefinity graphics card you MUST use a Displayport for one monitor; any adapters used must be "active" displayport adapters for this to work). What is the lowest spec Eyefinity card that will pull this off? Thanks.|||www.AMD.com