Don't get me wrong guys, I'm sure the go pro etc are worth the money, if you really USE them. As I said above, for what I'LL be using I for, it is well outside of my sensible budget.
The cheap Chinese jobs, just not quite enough in the quality stakes, hence going for second hand, and something like the archos. Hopefully it will be a good enough compromise for less than the go pro.
Plus it will have the added advantage of being a movie viewer and MP3 player at the same time.
As a new for new comparison, the archos probably works out more expensive than the go pro, but the go pro seems to hold its value much better - probably because it is a dedicated track cam type affair, rather than a dvr with an added camera.
At the end of the day, I managed to swing it past the wife without any drama, so I'm happy