I ride a white Icon Alliance. It's been my primary helmet for two years, and I fucking love it- very comfortable.
IIRC, Revzilla or BikeBandit recently recommended it as the best helmet for under $600, because it's comfortable, it's DOT and ECE rated, it's quiet, and it doesn't fog.
By and large, I'm kinda over Icon's build quality (neat style- shoddy work), but do like their helmets. YMMV.