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for video, I'd sell the 7d and get two 550D
the 5D has:
* bigger sensor --> use your lenses as they're supposed to be used, get shallower DoF
* better colors
* higher noiseless ISO
* magic lantern (available on 5D2 and 550D, but not on 7D; coming soon for 60D)
so for weddings you get to use higher ISO values (1250 instead of 640), but will have a hard time focusing because of the shallower DoF (if you stop your lenses down to compensate for this, you lose all the ISO advantage)
on the other hand, for video, 7D and 550D are exactly the same, except:
* 7D has fullres HDMI out while recording and weather-sealed body
* 550D has magic lantern
so for me 550D is a better camera, even without taking into account that the price is about 1/2
Stay with the 5D and GET a 7D as 2nd cam.
Ted, I beleive this is exactly the setup the OP currently has. However, he says he needs a 3rd camera.
I don't believe that is entirely accurate. I have never read or seen mentioned that the 5d resolves better color detail.