Carolinas RC in Charlotte. Nicest indoor track ever. http://carolinasrc.com/Webstore/Scripts/default.asp

Charlotte RC Motorsports Park(Formely The Farm 2 where the worlds were held last year)
http://www.charlottercpark.com/

There are literally about 10 tracks within 1.5 hrs of Charlotte it. Those 2 are top notch though and withing 30 minutes of the race track.