I've just started cycling, but I wear Bolle downdraft sunglasses. I like them 'cause they wrap around and protect the side as well as the front from git and bugs etc. I already had them for normal wear. They look better than the pic. Mine are blue. I've enclosed a link so you can have a look. Hope this helps.
Margaret

http://www.sporteyes.com/bollealtitude.htm#*Downdraft