Ok, long question: Right now I have a t2i with the kit lens, I am using it a lot for a film internship I have and to film videos for several groups and people. I am selling my downhill bike so I was planning on buying some more glass for it, specifically the sigma 18-200 f/3.5-6.3 AF OS, the canon nifty fifty, and the Rokinon 8mm fish, I just found out though that I could sell my t2i and kit and potentially upgrade to a 7d, of course I would have fewer lenses, so I would probably just end up with the sigma 18-200 and the nifty fifty if I went to the 7d. I can get a 7d with two batteries for $850 (of course I will try to talk them down). So basically, is it worth it to upgrade to the 7d or should I just stick with my t2i and get more lenses? Right now I am really leaning toward the 7d for 8fps, magnesium body, and weather sealing. Also, what do you think of those lens choices? Is there better glass at that price point I should be looking at? Any advice would be super helpful, Thanks!