before you look at all the options available, you need to decide what you want to do and what you have
do you want to spend time editing your videos ?? need good computer and perhaps some software
do you want SLO MO, then need to look at camera options
are you ever going to NEED more than 720p ?? youtube is fine with 720
if your SD is big enough, who needs wireless??
i bought a GoPro 1.0 -- there was a 1.1 also ie got first model and it was NOT expensive and does what i want ...
i use it for self-improvement
as long as it is waterproof, has different supports for different perspectives and can be manipulated without opening the case
one can have a lot of fun with LESS
here is an analysis I did a while back when I was looking for a waterproof camera to play with:
joewindsurfer.blogspot.com/2012/12/gopro-hero.html