You can always get in touch with the Ferrari of Washington folks. They have some decent classes, aren't too expensive and permit Lotus cars.
The BMW CCA schools are great, but to get in, you'd really need to be a member. Worth it, because their schools are the best deal, and very,very well run. Plus an Elise or two would be a hit with instructors.
Lastly, there is a guy, Walid, who owns a shop out near Dulles that's name escapes me. (Will edit with its name) He rents the entire track every so often for clients, friends, etc, and you are basically out driving on your own! (Yo really do need quite alot of experience to do this)