I use Divers Paradise in Webster.
281-395-9292
they have had the same tech for 15 years. They can do most regs except Scubapro.
They are dealers for Aeris, Mares, Dacor, Tusa, & Tilos.
They are one of the cheapest I have found. $129 for a full octopus setup including regular service parts for out of warranty service.
Some people don't get along with the owner there but they do have some of the best prices and the service is fast and done well. You don't have to wait 4 weeks for it to get done!
they aren't perfect-but they have very few returns on servicing and many times it is due to unforceable things like a pinched o-ring during assembly that does not show up during pressure testing until it finally gives days later, or foreign object entry(sand, etc.) getting into the reg during/after dives. I talked to one guy who said they put his Viper 2nd back together wrong but that is impossible. It only freeflowed because it needed adjusting-(a 30 sec. ordeal) The "local" that looked at it during the trip was just puffing himself up and making the customer feel good.
Most people don't realize that it takes about 250 cycles (breathes) before the seat sets in the 2nd stage and if you pick it up and leave on a trip the day after it is serviced it probably is not at it's best adjustment.