As Jake said, the Dirt Stockers are 'it' if it's truly a wet race. For intermediate conditions, I like full-tread Toyo Proxes RA1's. They'll work in the wet, just not as good as the Hoosiers. But, they won't be junk in 5 laps if it dries out.
------------------
MARRS #25 ITB Rabbit GTI
SCCA 279608