I've been using JX servos for a little over a year now in both my 1/8 buggy and truggy.... the gears are lasting about 10+ months before they strip so not sure if this will meet your needs.

I've been hearing good things about SRT servos and have recently bought one to start testing this weekend, but you'll need to enable HV if you want fast speed out of them, more info here:
https://www.rctech.net/forum/radio-e...-servos-2.html