Will a displayport adapter work with eyefinity for 3 moniters?

my situation, i have 2 monitors right now. I like them. But i would like to get a HDTV and wall mount it. I would then plug it into my computer and play movies on it. Problem is, i only have 1 slot for a video card. Right now, i have an 8800gt, i cant plug another connection into it so im thinking about upgrading to the 5850. BUT i just found out that to use 3 monitors, you have to have one of the connections be display port. Its sort of a bummer. But whatever. Nothings perfect.

So here are my 3 monitors (when i get the hdtv)

22in lcd w/ DVI and HDMI connections
17in lcd w/ integrated rgb connection.
37in lcd w/ HDMI or DVI (prefer hdmi though)

None of them have a display port. So one of my questions is, will an adapter work with the eyefinity tech? Then, what monitor should get the display port? I don't think it really matters, but im thinking i would throw it on the 17in. Because that monitor will never be gamed on. Just desktop work.

What do you think? Any input is appreciated. Thanks