Audio is tough with the GoPro's, on top of that I was using the water tight housing. You really only hear things banging up against the housing, everything else is muffled. That's why I added the music, you may find that most gopro videos simply cut the audio out and replace it with a soundtrack as well.
I also had a tough time getting youtube to not utterly butcher my videos. Generally my picture quality took a nose dive, but I think I've found a safe bitrate where youtube doesn't have to do a whole lot of compression.
My only other real experience with video editing has been in iMovie. Premiere Pro is a bit more challenging at first, but I don't think it will be as limiting in the long run. I have the Adobe Master Collection CS5, I still need to play with After Effects, that should be fun. Currently my pc has an i5 2500k, 8g of ram, evga 560ti superclocked, and an ASRock p67 Extreme. Seems to run well, render times are pretty quick.
For now I've mostly been searching youtube videos for whatever tips I needed at the time, learned a lot from very basic video tutorials haha. Thanks for the link, I'll be checking those out.