of the gopro cameras i would suggest the hd. the clarity of the hd is far better then that of the normal wide hero. if you buy the normal wide gopro you will have to buy batteries for it which wont last nearly as long as the lithium battery that comes with the hd. when you change the batteries out on the wideo hero you lose the date setting every time, with the hd you charge the battery while its in the camera so you dont have to keep resetting the date every time. also, because of the longer lasting video on the hd you are able to use a larger memory card so you dont have to take the memory card out after every ride to download it to your computer (needed when using the wide hero) and the batterys dont last long enough to fill a 4gb memory card on the wide. another thing cool about the hd is the ability to change from 5 different resolutions on the fly fro normal WVGA up to 1080p.
havent heard much about the contourhd except that in order to change any of the settings you need to hook it up to a computer to do so. but looks wise i'd say the contour looks sleeker.