+1 for Al's advice. Black 3+ is the go, from memory the black 3+ will also do 4K video. Also there's something inconspicuous about black cameras...
.
Al mentioned the BackPac, make sure you get the
Backpac Limited Edition from the online store that way you get the large housing needed for that option (basically for free), the retail stores don't have the Limited Edition option, which means you need to buy an additional housing. It only takes a few days for stuff to come from the online store. The floaty back door is a good idea if you're venturing in to the water as your new gadget will sink if you happen to drop it or whatever you have it mounted on lets go. While you're ordering at the online store it's worth getting the
tripod mount kit. You'll need a couple of memory cards as well, the online store has those as well.
I bought a carry case to store everything mine is an
SP POV large case (still quite small) and houses everything nicely, they're available at Hardly Normal for around $90. I notice that Deal Extreme seem to have a clone of that case,
http://dx.com/p/telesin-protective-e...2-black-259982 at $28 US it would probably be worth the gamble getting the DE one.
Once you have the camera download the app for your smartphone, beats the remote hands down.