HD, so probably need a fair size one.

anything in particular I need to look out for/avoid?

I always use mymemory (stick it in Google).

Got a 4Gb Lexar Professional one from there a while back for a decent price.

Things to avoid – don't go for a bargain basement, budget card as it may not be fast enough. It 'should' be, but a decent card is so cheap you might as well spend a bit more and get a better card.

I ordered this 16GB Kingston off amazon.

http://www.amazon.co.uk/gp/product/B0013AV9TW/

Its the recommended one, and not had any issues with it. There are big problems with some brands at the HD hero, so definately stick to the GoPro recommended ones.

As per MMB, Amazon for a Class 4 Kingston. I initially bought one from eBay, and the seller sent me a class 6, which my GoPro didn't like at all, they're very fussy.

Stick with the above, and you should be fine – not worth the hassle of getting something which isn't compatible and sending it back.

Cheers, Rich

amazon

great, thanks for the advice.