I dunno. I'm obviously a big fan of Turning Point Beer which is local to me. I'd be happy to drink almost any of their IPAs (except for ones containing lactose) at any time. Celestial Beerworks in Dallas also makes great beers but I rarely go to Dallas. If I had to choose a beer that sees actual distribution in grocery stores/liquor stores I would probably say Spindletap's Houston Haze. They started sending cans to DFW last year (I think) and I'm super happy about it.
If you are talking any IPA including those that don't distribute to this area then that would be an impossible question for me to answer as there are so many great beers available