FYI, Cornerspeed is a school and will require you to have either taken their school or another riding school in the last couple years. I would recommend the Cornerspeed school, but if you are coming from a ways away, Nesba could get you a couple days on track...
Mid-Ohio's program is getting better. The first year was weird but this year I think they did a good job. Lots of track time and they feed you burgers. Best events for me are the Saturday evening track days(cheaper). Make sure you are hydrated and full of gas and you can ride for a solid 2 hours if I remember right.
That's good to hear - I stopped going when STT wasn't running it anymore, but I'd really like to get back out there. It's a totally awesome track (in the dry!).