A few sites are trying to pull together cap data for all teams as they look ahead to the opening of the UFA signing window on 2/27. AsktheCommish is one such site, and like our cap page here, they acknowledge that the data is unofficial and compiled largely from NFLPA and "various media sources" (as I'm guessing USAToday and even ItB.com might qualify).
Anyhoo, the Texans rank 10th on this list with the most available cap room. I've seen another adjusted for the forwarded cap space from 2008 that ranks the team around 11th.
http://www.askthecommish.com/salarycap/numbers.asp
Most striking to me is that the Cardinals, defending NFC champs, are 2nd with roughly $41 million available. The Titans are 5th.
So while 11th puts the Texans closer to the middle of the pack than way out in front, it does represent the team's ability to re-sign all they players they choose. It also affords them an opportunity to take a hard look at other UFAs as well.
We are nearing the end of the calm here (if you discount the Outside the Lines thriller)... in another two weeks or so, we're going to be busting with some news.