Since the original poster found his answer, I thought i'd share this with everyone else...
Like one guy mentioned, go to
www.PowertoChoose.org
Rates change every 15 days... first of the month, then the fifteenth/sixteenth.
"winter rates" seem to be substantially cheaper then summer rates, so now is the time to lock in a rate, unlike me, who signed up in August. Woops.
There are a few scam energy companies in Texas (3 at LEAST), so please do your research. I believe Ambit energy is one, as you have to become a member, then recruit other members to join, but please research first.
http://www.electricitybid.com/electricity/index.php/2007/12/04/ambit-energy-scam/
Compare rates, and watch your terms very closely.
The longer you can settle in to a contract, it might be better, even if for a little more money. My rate went from $.12/kwatt to $.18/kwatt at the end of my 12month contract with less then 1 months notice of rate change. I had to change companies to get a better deal, where I locked in at $.14/kwatt for 3 years. I still like to watch the rates though, just in case.
For my area, (your area may vary), I've used and liked "reliant energy", and now "Startex".