Ok, I've been contemplating this for awhile. The Carolinas chapter of the PCA is holding a DE the first weekend in October. Not sure how many they accept, already 85 enrolled, usually about 180 applications.
I hope mine goes throught. It took awhile to talk myself into it. So, until I get accepted I won't take the plunge on a helmet. Here's a link to the track:
http://www.carolinamotorsportspark.com/index.2.gif