Most road tracks that I have been to now require SA2005. I got my helmet from helmet city. They have pretty good price and the customer service was excellent. They didn't have the helmet I ordered so the immediately called me and upgraded me to the next model for no additional cost.

I have this helmet http://www.helmetcity.com/page/HC/PROD/aut...face/openfacesa and I really like it.
My buddy got a full face one http://www.helmetcity.com/page/HC/PROD/bell/2004356 and he loves his as well.

Also just like with shoes not all helmet sizes are the same. If you were going to order online give helmetcity a call and they can find the perfect helmet for you

 

speaking of shoes don't wear your clunkers. You're going to be doing a lot of footwork!