David - you should enter our X class. PAX index decides the winner. Last event we had 17 entrants. I'll probably be in X this weekend too.
TMANAG08 - definitely run Novice your first time. We also offer a Novice walk through that I highly recommend. It's immediately before the drivers meeting. Tommy Saunders does the walk through, and always points out things that 'mere mortals' (just ask him!) don't think of. He does a great job with the walk through. It sounds like you've got a couple of offers for rides as well. Take advantage of all of them. Ride with someone, get someone to ride with you, etc. Don't sweat the class or car - get into a car with someone who's experienced and fast. If you end up having trouble finding rides, find me at the event. I'll make sure you get taken care of. I'll be the funny looking guy conducting the drivers meeting.
You can change your class at registration the morning of the event, but if you can do it online ahead of time it helps the worker chiefs put together a more balanced heat structure.