I would find it a little shocking if a photographer DIDN'T think image quality rendered by the sensor was the most important thing in a body
Noboidy said that image quality doesn't matter... But in MY opinion the image quality at ALL cameras is currently at such a high level, that other features are simply more important. Otherwise nobody would buy a 7D instead of a 600D.
And - back to cars - if every car has the same engine, the engine becomes quite(!!) unimportant for the choice of the right car. I'm not firm with american cars but in I guess everyone knows BMW... The BMW 5 (http://www.bmw.de/de/de/newvehicles/5series/touring/2010/showroom/index.html
) had in one variation the same engine as an Opel Omega (that costs a third of the BMW). And yes, the engine is one of the most important parts of the car, but nobody would buy a car just because of a cool 500PS engine.
I certainly bought my cameras based on their sensors..
I won't. I craving for new cam and new features for new 5D but I really don't care about the sensor. Yeah, would be nice to have a little bit more ISO but, there are other things that are more important to me. And if you have to decide between 7D/60D/600D the sensor makes no difference.
Even going to a 600D will be a big improvement, but of course I could really use the features of a 7D.
The question is, what you want and if you can wait. I also have a rebel. I need more photo and more video. At the current time I would buy a 7D. But since the lack of a flip screen I won't buy. I can wait a couple of months. There definitley WILL be a new 5D in the next months and probably a new 7D next year.
So either one of them is so cool that I will buy them or - if not - the price for the 7D will at least go down a lot.
So if I were you: I would wait. The alternative: If you need video now: Buy a 600D (or 550D) and sell it if a new cam comes out.
As I said: I think the 600D is really a great cam.