If you can hold off a few months, Blade is coming out with a GoPro compatible Quad Rotor. Its called the Blade 350QX. Do a Google search if you want to find out more about it.
It will sell RTF for under 500 bucks. I think at the present the pricing is...
469.00 for RTF
419.00 for BNF
IMO...I think this would be the ONLY way to go on the inexpensive route for attaching a GoPro cam and not knowing ANYTHING about helis and just want something that "just works" out of the box with no tweaking.
just my opinion though.