I love the ESS V12 Advancer, got mine for less than 70$ with 3 lenses (Clear, smoked and yellow).
Airflow is very good, it is low profile, and quite light.
If you want something lighter, you can try Bolle cobra (
http://www.bolle-safety.fr/Cobra--5170.html ) but I got fog with a stormy/wet weather. Not (or really less) with V12.
FYI, I use fogtech most of the time.