Hopefully, he's lost his appetite for losing and won't try again. He's not very well liked by those who know him, and I'd certainly never vote for him.
Other than that, the only other person I can think of who could be a contender from the Houston area would be Orlando Sanchez who is currently running for Mayor. If he doesn't win, and it will be a very close election, he might file for that congressional seat. He'd clobber you in the Houston region, but I haven't analyzed the population breakdown of the district. Hopefully, he'll win the Mayoral contest next month, and you won't have to worry about it.
You would crush Doggett if you faced him in that district, and you could probably expect substantial financial support from the GOP to ensure it.