welcome, and i hope you get hooked and enjoy it
a couple of things:
1. try this thread for openers -- http://sccaforums.com/forums/thread/296985.aspx
2. since autox is mostly driver, and very few folks start out fast, i wouldn't weigh the autox part of the new car decision too heavily. there are a host of affordable new cars that will serve you well on the street and also provide a capable platform to learn the humbling art of solo II
3. my personal bias is Mini - but that's just me (they are kinda popular in several classes - to put it mildly)
but mostly, good luck and have fun - i assume you've found your local region?
Charlie Thompson
'04 JCW Cooper [STX]
NER Cannon Fodder