It seems to me that Southern Lit is taken more seriously in the South! For example, Ole Miss has the Center for Study of Southern Culture. Big state schools such as UGA or LSU also have a lot of professors who focus in the literature of the region they're in. If there's a specific author you're interested in - say Chopin or Poe - look to the cities they called home and the schools in that area, such as New Orleans (Tulane, LSU, etc) or Charleston (USC, CofC, the Citadel) to find professors who focus on those authors.