Replying to GoPro HD or Oregon Scientific ATC9k

ACHTUNG (scnr :p)

as I know what I want and only need to decide between these two candidates, my questions would be:

- is there a significant difference in quality between the two?
- is there a difference in audio quality?
- which camera offers the better helmet adapter?
- any thoughts on the wide array of straps/adapters coming with the ATC?
- finally, will my Notebook (Core2Duo T4300 (2x2,1GHz), 4GB RAM and a ATI HD4330 Mobility) be sufficient for HD editing?

Best prices in Germany:
Go Pro HD: 300€
ATC9k: 180€

What should I go for? Please help :]

Danke