I like the Belgians, Duval, Chimay etc. If you get a chance try the Unibroue beers, a Belgian style, they are out of Canada and can be found in the liquor stores in TN.
I like most of the LM beers and my fav is Blue Heron.
Nobody mentioned Yazoo Brewery out of Nashville. They have a Hop Project which is fine and there is another brewer called Blackstone in Nashville that does really good stuff.
Someone mentioned Boulevard (most everything they make is really good), they also have the Smokestack series which are high gravity gems.
Stone, Dogfish Head, Russian River, Alesmith, Boulder Beer, Belles, Boscos, etc. damn, how do I pick a favorite.
For you wheat beer drinkers, Boscos makes one of the finest Hefeweisen I have ever had and Boscos private label is the Ghost River label and most of those are very good.
Damn, now I have to go beer shopping.