UT's IO group is awesome. I'm there now, finishing, and it's growing by leaps and bounds. I can highly encourage it if you're willing to work hard. David Sibley, Eugenio Miravete, Stephen Ryan, Stephanie Houghton, and Haiqing Xu are currently there, and I understand there could be another additional senior hire this next year. If they go through, either of the ones they're looking at, would be an awesome addition to the department.
Econometrics at UT is also pretty nice. Jason Abrevaya, Stephan Donald, Haiqing Xu, Brendan Kline, and Sukjin Han, if memory serves correct, are the theoretical econometricians. All the empirical IO folks do applied econometrics, as well as the microeconometrics/labor field folks.
I don't know much about Pitt or Irvine. Penn and Wisconsin are great schools.