also i'm going to bring up a question about what you want to do with it. do you want to do POV shots and something you can take in the water/ get a lot of snow on? if so, get a gopro
if you want to make more cinematic shots or follow cams through the park and stuff, get a nicer camera. also the nice camera (t2i or similar) offers more room for growth. with a gopro, you are stuck with exactly what you have (minus maybe a few software updates). something like a t2i is generally accepted as a great camera, short of professional quality, but anything that the general public or low time filmmaker would need (a lot of good edits/webisodes on here are filmed with a t2i). also once you get a body and a lens, there are so many more things you can start getting to expand your possibilities, such as new lenses (wide angles, fisheyes, telephoto, etc) as well as glidecams, mics, etc
sparknotes: POV shots with an durable/waterproof camera with no room to upgrade: gopro
awesome looking follow cam/stationary shots with tons of room to upgrade and improve your skills: t2i