In reply to ChrisJD:
in addition to chris's advice can i add a couple of points?
BEFORE you spend any money go to the forums and do a bit of reading
http://goprouser.freeforums.org
in summry
A decent machine for editing
something like sony vegas (£40 to £60) for editing
spare batteries (wassabi power for example)
a couple of 32Gb cards... DO NOT BUY CHEAP SH1T CARDS go with the ones recomended on the forums, you will regret buying cheap cards
get a card reader!!! don't plug the camera into the USB port to copy files over
update the device firmware when you get it
format the card every time on camera before you use it
expect that sometimes it might not work
despite all that i'd still recomend the gopro as the camera to get either the silver or black 3+ but if you think you might use the gopro remote, buy the black as the silver plus remote is the same price as the black with the remote (daft but true)
oh and finally
you will become a "mount collector" add that to your budget. the chest harness is a "must" for many sports for example