I was in a similar situation to you a while ago and looked at all the options from cheap, to expensive. Ended up buying a GoPro white with wifi for $240 brand new. IMO unless you're wanting broadcast quality no need for a GoPro Black, or even GoPro silver. The white will still give you awesome 1080P quality whilst being simple to use.
Apart from the obvious benefits of a GoPro, when I was looking there were 10 times the amount of accessories available compared to others, online and in stores, as well as a host of forums dedicated to using the GoPro, hints and tips etc. And with such popularity, if you don't think you will use the camera again after your trip you will have no trouble selling the camera online.
So for a couple of hundred dollar outlay it was a no brainer for me to get a GoPro, rather than save $100 on a GoPro lookalike. Alternatively you could always keep your eye on eBay or gumtree for a near new one as plenty of them pop up regularly.