Savox 1251/1252 or PowerHD R12. PowerHD also is an oem for other brands like muchmore CDS10 or SRT. These usually have titanium and aluminium gears that develop a bit of play after a few crashes, regardless of servo saver.

PowerHD's B7 or S15 are a bit more expensive but have titanium and steel gears, which should be a bit more durable.

Anything more expensive doesn't really get better in any noticeable way, and are sometimes worse. I dont even think pro's use stuff like the futaba ct700.