Well this is probably late for a recommendation but I thought I would throw in my two cents on a particular model.
I bought a Scorpion EXO 700 for ~$110 on an internet site. You will find a similar price at several. It is DOT and Snell rated (if that means anything to you) extremely comfortable, has good airflow and WILL NOT FOG. It is a nice helmet for a good price. And as far as full face visability goes, it does not intrude into my vision at all.
The downside is that Scorpions can have a larger shell size than say an Arai, so it has a bobblehead look, but it is a nice piece.
I was looking at user reviews on one site and a guy claimed he high-sided at high speed and hit head first at the track on a crotch rocket and walked away. He could be lying, but he swore by the thing. I have seen threads on other boards about bad helmet experiences and lots of dental work using cheap helemts. I will spend the extra cash, thanks. I plan to keep the Scorpion as a second and get an Arai next year.