JR 9100T steering and 9100S throttle/brake. In due time the plastic gear will wear and give out. JR is all metal gears, 3 year warranty and the S is one of the fastest on the market, .06@60-6volts.
Airtronics has the erg-vb high torque, metal gears with one plastic like the ace servo, it lasted me 5 months till the plastic one lost a few teeth. I smacked the tube on the track and lost steering, went to JR and havent looked back.