I ordered the surf hd on kitehero.com you get a free linemount which are usually $40 ordered a week ago although haven't got it yet. I'm gonna buy a gath helmet as well for pov filming

pretty sure there the same camera but every kit has different mounts for that sport eg the the go pro hero car one has mounts for mounting it to your bumper etc the surf one has mounts for your surf board etc etc, go on the go pro web site and check em out but im sure they are the camera just different mounts.

Yeah camera and case is same for all versions of the HD.
Best value is probably helmet hero cause it comes with the most expensive mounts (vented helmet and head strap), naked has the least (one flat mount).
Surf is a naked plus surf expansion kit (fcs plug mount, adhesive round mound, anti vibration plastic plug thingy).
Motor sports hero (suction cup mount, 2 round and 2 flat mounts, j mount, extension etc).
The grab bag is good as it has the coverted J Mount (plus extention, 1 flat, 1 curved, one anti-vibe plug, and lanyard)
Buy your kit based on the primary use and then buy the secondary mounts, but do your math first as some combinations could save you 20-50 bucks.
Eyeofmine.com have some interesting custom mounts, but they cannot sell standard accessories out of their territory. hey have Theaps of vids showing how each mount works and what to use it for.

Click on this link to see all the HD camera versions, then click on each one to see whats included.
There is also a link on that page to all the accessories we carry, in stock now and shipped for free.
www.kitepower.com.au/collections/other/GoPro

The Contour HD is worth a look too.