Mid-ohio?
Nelson Ledges is the cheapest to go to at $120 per day, but the track is a bit rough and can be dangerous for a noob if he doesn't have his head screwed right. Beaverun is a great tract not as techical as Mid-Ohio but has a good balance, plenty of runoff space in case you do something stupid and the price is not too bad. Of the other tracks I've only been to Waterford hills which is a great small track, their events are well run and inexpensive ($150).

