I have had excellent results with the G-Max 68 full face helmet for around $120 USD.. On Webbikeworld.com it had good reviews and was "Helmet of the Year" a few years back. Also, if you have a Kymco scooter in the metallic Pearl White color the G-Max white is a perfect match.
Optically perfect shield, great ventilation (needed here in Florida), quiet (my opinion - most say it's quiet and a few say otherwise), and also has a 6-LED red light built into the rear with an optional transmitter that can be triggered from your bikes brake light.
The only negative in cold climates is that there are two additional side vents in the chin bar that can't be open/closed easily - helmet comes with foam plugs to block them inside if you don't want the ventilation from them. Below is the model 68 full face - I have this in addition to one of the model 67 open-face versions which I like also.
Here is the review on Webbikeworld: (User comment section has some post-crash photos of the GM68 - it did well)
http://www.webbikeworld.com/r2/motorcycle-helmet/gmax/gm68s/And their video review:
Brent