I'm thinking of getting into a 1st gen MR2 for autocross use. Which are the best model years and what should I look for/avoid in a used one?

welcome to the wonderful world of mr2's! i couldn't tell you about the mki's, but the best place to start would be to ask on the mr2 board. you can post either in the autox forum (http://www.board.mr2faq.com/forumdisplay.php?s=&forumid=6) or in the mki tech forum (http://www.board.mr2faq.com/forumdisplay.php?s=&forumid=2)

good luck!

EDIT: Never mind, i see you already found your way over there! :)