The most obvious choice for my budget (let's say 2000-2500 for the whole setup) is the T2i. I'd get the kit with the EF-S 18-135mm f/3.5-5.6 IS lens (not the basic kit): http://www.bhphotovideo.com/c/product/680673-REG/Canon_4462B005_Canon_EOS_Rebel_T2i.html
Now I know this probably isn't the best lens, but would it be good to get started with photography and experiment so after I know what kind of lens I want to expand to?
On the filming side, I'm gonna need a fisheye, I was thinking one of these two:
Canon Fisheye EF 15mm f/2.8 Autofocus
As for the accessories, I am for sure getting a tripod, a glidecam, a camera pack, extra memory cards, etc. But I was wondering if, when you've got the battery grip on the T2i, if you can still put it on a tripod/glidecam, because if I can't it would be pretty useless getting the battery grip for me, I'd just get extra batteries.
And before anybody tells me to upgrade my computer before I get a HD camera, I've got the latest 17" Macbook pro, so that won't be a problem.
Thanks a lot to anybody who helps me!