You know, I've been debating this morning on the 50D too. Video isn't important to me (although it might be nice after getting a terrible video out of our HD Flip yesterday). What I really want is a better sensor for low light indoor shooting without always having to have my flash (I want to learn about photography's ins and outs to further understand the appropriate settings, but I'd like to have a little more room for error in low lighting (thus less noise) than I do now. I have a 430EX flash that I bounce, but it eats batteries so fast and makes the camera so much more bulky that I've been leaving it off more and more.
I think I've ruled out the 60D just because I really don't like the moving screen (a weak point that could be broken easily) and the plastic body.
So could I now get opinions between the 50D and 7D?
I only have the kit lens for the XTi (but will likely be selling it with the camera), a 50mm f/1.8 prime (that stays on the camera 95% of the time) and a 55-250mm f/4-5.6 IS Telephoto Zoom lens that I got for super cheap and hope to use more once the kids start sports. I want to upgrade the camera and then work on my lens collection.