How much are your parents wiling to pay? I would assume that alone would take the 5D out of the picture since it costs $800 more.
The 7D has better video modes - 1920 x 1080 (30, 25, 24 fps), 1280 x 720 (60, 50 fps), 640 x 480 (60, 50 fps)
5D -1920 x 1080 (30 fps), 640 x 480 (30 fps).
The full frame of the 5D is going to give you better image noise performance at high ISO, which I think won't be that useful for what you are doing).
I need more shooting options such as the 7D because I use twixtor a lot, and the footy needs to be 60 fps or it looks awkward. My parents are willing to help me out on the body but the lenses are up to me, so I have about 9 bones saved up...
any suggestions on lenses, I really want to get a 85mm prime for insane focus pulls, but that lens is a grand
What Canon L glass should I get?