Hey Airtime,
Nice footage, and welcome to the forum!
That's a tough order to fill. You've probably selected the most challenging environment for a camera to work with-
1. Rapid constant motion in frame (check)
2. Repeated hard shocks to the operator (check)
3. An environment filled with water spray and sand (check)
I haven't personally tested an HDV camera to full image destruction, but hard shocks to the camera can even cause DV level compression to break apart.
It's about double your price range with media, but the Panasonic HVX-200 may be a good fit. Not only does it use DVCPROHD compression, which uses discrete frames like DV, and not a complex GOP structure, which should help in compressing all that movement in the frame; but it has a 60p (60fps) mode in HD, that would capture the wake boarding beautifully, and allow you to get some stuning slow motion as well.
As far as under $4,000. There's a lot of new HDV cameras coming out in that price range right now.
I'd certainly try to get an HDV camera out on the boat and try it out before you buy something in that format though.
Maybe someone else has experience on these boards using HDV in rougher environments?
John Burkhart
Editor-in-Chief
Videomaker