Was there some feature in the 7D that the T2i lacks that you specifically needed/wanted? Better build, sealing, flash control, custom functions maybe? From an image capture point of view I thought they were quite similar. Unless there is some reason you didn't mention that is important to you, I'd focus on glass to make the most of the body you have.

17-55 f2.8 seems to be one to recommend. With the items you mention shooting, the wider aperture compared to 24-105 f4 will be helpful for capturing action indoors. As a possible alternative to the 135, a 100 mm L macro might be worthy of consideration. A little shorter reach, f2.8 instead of f2, has IS and of course it is a macro lens which may also be of interest to you. Just a thought.