The Go-Pro has been just fine by me, I've just got the new HD one, but haven't had a chance to get it out on track yet.
As far as angles go, I have tried almost everything, and have found that the front, facing back at you is the best one to help figure out riding position and throttle control.
Here's link to one I put up on youtube: Rear Facing at Jennings FL
As already mentioned the go pro comes with heaps of mounting solutions, so this wasn't hard to do.
Cheers,