Racer wholesale in Roswell Georgia is a good source for safety equipment.
Do yourself a big favor and try the helmet on before you buy it. This is one item that is hard to buy through mailorder because fit is so important.
I have worn different helmets over the years and even though they are supposedly the same size, the fit varies from different manucturers.
I would recommend an SA rated helmet for auto type events so that you know you will have a helmet that will pass tech at any event you go to. The "M" rated helmets are not allowed in some events, so the SA is the way to go.
I currently have a pair of Bell SR-Pro(s) which I use in SCCA competition.
I like the fit much more than the simpson voyager I used to have. The bell has more room around the ear for the earpiece for my radio, and it also has a little better fit around my cheeks.
It is a full faced helmet without a shield , made primarily for closed cockpit cars.
It is fine, but I have had trouble with it catching air when driving open top cars while instructing at schools.
If you plan to ever need a helmet in an open car, get one with a shield. Oh, and while you're at it, spend another 20 bucks and get yourself a neck brace/collar.