These may not be as rare and exotic as you want, but here are some good local/TX suggestions...
Rahr Brewery in Fort Worth. I like the Stormcloud IPA.
Franconia in McKinney. The Lager and the Dunkel are tasty.
Saint Arnold in Houston. Try the Fancy Lawnmower.
Real Ale in Blanco. Fireman's 4 and Rio Blanco are both nice.