[Twixboy]

I'm looking to enter my first autocross event this summer, but I'm a total newbie. I'm most likely going to register for the SCCA Starting Line one-day autocross course in Ayer, MA on April 18. They offer the option of adding a Bell open face helmet for $100 or a full face helmet for $200. Which one would you guys recommend? I'm thinking open face would be better because of the better field of vision. I might also join BMWCCA to run with them, but I heard they just changed their helmet requirements. Do you think an open face will be good for autocross for the next several years, or will I eventually need to buy a full face helmet if every org changes their rules?

Also, does it make a difference if I'm in a convertible vs a regular car? I'd be registering for these events in my Z4. I'm assuming the factory roll bar is fine for SCCA and BMWCCA autocross, right?