I am one of the users who actually switched from a 550d to the 7D. Reason being, the 550D's grip was way too small for my hands. I bought it initially and thought it was ok. But soon after fitting heavier gear like the 24-70 and a 580exii, a day's shoot renders my hands aching in pain, even after the addition of a battery grip.
Having switched to the 7D, I'm very satisfied with the grip and the performance. The in camera picture processing is less aggressive then the 550D and it somehow forces me to learn more about PP since I was an "anti-PP" previously.
If cost is major factor since you have a new born, maybe you'd like getting your equipment from the buy and sell section of the forum. I got my 7D for $1300 from there =)
:bigeyes: you must be damn lucky to have gotten it at that price........:thumbsup:
Anyway, I agree with your view, if TS get the 600D, he may find i annoying if he were to mount a heavy lens with flash on it. It will become very unbalance.