Canon T2i Fisheye opions

All depends on how much money you want to spend. If your wanting cheap the rokinon/samyang/bower 8mm is good for about 250. There is the canon 15mm for about $500. Or you could just go all out and get the canon 8-15mm for $1500

Do you think i should get a fish eye? or should i only use those for my skate footage?

Honestly, unless you're looking into doing a lot more photography with it, just shoot fisheye shit with your gopro... It's perfectly acceptable unless you're really trying to tie in audio.

If you really do want to get a fisheye for your T2i, do yourself a favour and absolutely avoid at all costs, anything other than the Samyang fisheye. You can get them used for around 200$. They're relatively decent, and they're made well. I used to have one, and it was good for the few times I ever really used it.

The 15mm is useless on a T2i, and the 8-15mm is one of the dumbest lenses out there to chunk 1500$ on.

That said, I'd recommend spending maybe another 100-150$ (so like 300-350$) on a Tokina 12-24mm f4 if you're really looking for a wide angle lens for your T2i. It's not as wide or fast as the 11-16, but it's a far more useful lens for the most part, and it's 200$ less than the 11-16.

Fisheyes are kinda cool for skate vids, but unless you're using a VX1000 with a deathlens, you'll never be that cool with one.

Get the Nikon 6mm f2.8.

All the slut's will be frothing at the gash when they see your massive bulbous element.

Fisheye: opteka 6.5mm $190 or rokinon 8mm. supposedly the exact same but rokinon glass will be a lot better.
opteka link http://www.amazon.com/Opteka-Aspherical-Fisheye-Removable-Digital/dp/B00KGE4VS2/ref=sr_1_1?ie=UTF8&qid=1408937822&sr=8-1&keywords=opteka+6.5mm+fisheye

rokinon link http://www.amazon.com/Rokinon-FE8M-C-F3-5-Fisheye-Canon/dp/B002LTXQUE/ref=sr_1_1?ie=UTF8&qid=1408937856&sr=8-1&keywords=rokinon+8mm

I have and love the opteka 6.5, I don't love it for filming but it is sick for photos, Sklar also took a bunch of sick shots with his a while back