Originally posted by moxnix:
Open or closed face is a personal preference and both work fine.
This statement is correct, however, there is a memo from SCCA that recommends against full-face helmets in cars with air bags. If the airbag were to deploy (HIGHLY unlikely in auto-X but a possibility nonetheless) it could cause serious injury to the jaw, as it would impact the inside of the helmet, rather than the airbag.
I was originally going to go full face, but I decided to go open face after reading this.
Here's where I went for a helmet: Soloracer.com I stumbled into a killer deal. They had a batch of Pyrotect helmets on clearance, simply because they had the wrong color liner in them. 
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