I have been running the protek 130t in mine without any issues. They are rated for 288oz-in @ 6v and 355oz-in @ 7.4v and just as fast as those mentioned above . It is a little powerhouse of a servo and cheaper than the other two you guys just mentioned.

It has a few bad reviews but I honestly think they were flukes or just people that like to complain in general when things don't go their way. I have several of them and they all have been performing greater me.