I can recommend Steve Martin out of Dallas. He may have a trip to Houston that he is arranging soon.
He can be reached at
http://www.smartcalibration.com/
Steve did my set a while ago. We're going to finish up the job in a couple weeks.
Check out my website about the calibration, and I think you may get a little info about what happens during calibration:
http://dustin.davis.name/HomeTheatre/isf1.asp
If you're a newbie, some of that might be a bit too technical for you, but the summary is: for an investment of ~ $600, give or take $200 depending on your calibrator and the services you get, you picture will greatly improve.
Basically you are taking all the tweaks that the set is capable of but your average user does not know how to change, or is unable to measure in order to properly change, and optimizing them. This gives you a picture that more accurately produces what is on the source material, and is in general much "better" than the picture on a set that has not been calibrated.