Will probably want a Chesty too. Maybe the extend pole if he can figure out how to mount it on the surfboard for a different angle than from the foot of the board.
Regarding cost. The silver is about $100 less, but isn't as good in low light or speed shots. And
Best Buy (Canada) had a Father's Day special for a little over $500 that included the Hero3+ Black, spare battery, 32 GB micro SD, Chesty and helmet mounts. And the Hero3+ Black (at least for this sale) comes with the water proof casing and remote control. My sons also negotiated for a small bag of clamps and mounts that they had in the back. I am going to guess your Black Friday sales (did I get that right? the sale after American Thanksgiving?) will easily beat that deal. And probably wouldn't have to go to the store but snipe it online.
Bear with me as these are going to be Canadian prices, but should give you an idea:
Floaty (for the back of the housing which he definitely should get because of skurfing) - 30
Battery and charger - 15 - 40
Chesty - 50
Head strap and quick clip - 30
Helmet strap - 20
Side or front mounts - 25 or so
Wrist housing - 60
Go pole - 30
Monopole - 80
Viewer - 80
And there is a ton more stuff ranging from 10 - 60
Hope this helps.
Cheers!