IMHO... In terms of impressing a client (who has a clue about camera models), or impressing a fellow photographer in conversation about gear, you'd want to have the 5D2 or 7D. Just the word Rebel makes you look like a hobbyist in some people's eyes.
That said... In terms of reality... the finished product is what really matters right? There's practically no discernable difference between video shot on a T2i and a 7D, if shot through the same glass, with the same technique and skill. And its half the price of the 7D, and a third the price of the 5D2.
Mick_I's point about preferring to spend money on glass is on the mark, in my opinion. I shoot on both a 5D2 and a 7D, and the biggest quality differences I see usually has to do with what lens I use, not the body. And the body depreciates so much faster than the glass, its ridiculous.
I have a T2i on its way, as a third camera body option for video, when its needed. When its not needed for that purpose, it'll be my wife's walkaround camera, because I'm still afraid to show my face with something that says "Rebel" in my hand. I also never stop to ask for directions. hahahaha