Steering servo for ultra lx one
 

I've run about 8 -10 tanks through my lx1. It was brand new and the steering servo already seems to be acting funny. I've read their stock servos are terrible. Any suggestions on what I should get to replace it? I'm not looking to spend a lot as I'm new to the hobby and am just bashing as of now. It seems hitec is the way to go, I've read some decent things about the HS-645.