American Aquarium & DBT, like you said.
No one really rocks the southern genre like they do though, so you'll probably be disappointed in trying to find anyone that captures their sound.
Bingham (disregard his last album, also look into his unreleased stuff from Wishbone Saloon)
William Clark Green
Reckless and Micky
Charlie Hager & The Captain Legendary Band
Justin Townes Earle
(all more "country" oriented)
This post was edited on 10/13 at 5:32 am