May sound daft, but it depends on the speed of your computer as to how you can set a GP to record.
There is a saying in the states. "Another guy who's bought a $200 camera and now needs a $3000 rig"
If you have a very fast processor in your computer you can use the GP on top quality.
If not you will have to set the GP at a lower quality setting or you can't process it.
(I am no expert Dip, but I did some/a little research for Liam my son.)
Depends what you want, I use a cheapo waterproof £50 job for jet skiing. It does the job, Will,Colin,Darren and Graham have seen the quality of that and I think they will say it's pretty good.
Also I think most hosting sites downsize them ??
(This is all useless info,if you need to show them on a projector because then you need dogs danglies of quality.)