Yeah, just stick with the major brands (Airtronics, Futaba, KO, JR) and stay away from Hitec. Hitec servos are generally a little cheaper than the competition, but as a previous poster said, they don't center well, making them a bad choice for TC racing. I would like to say however that Hitec customer service is top notch. I had two servos I was having trouble with, so I sent them in for them to test, they couldn't find anything wrong with them, apparently, but they sent me the two servos back along with two brand new ones.
The only experience I have had with Hitec servos is with their 925BBMG servos (pre-digital hitec servos) however judging by other people's reports, the centering has not improved.
Josh