Best Servo for X6?

[Pownabown]

Hey folks

Just looking to get some ideas on the next servo to get for my X factory X6.
I have been running a hitec servo in my 2wd electric buggy for about 4 years but recently has started to loose it centre position.

Whats the best servo out there at the minute that people are running?
Need something fast but doesnt need to have huge torque.
Not sure weather to get another hitec servo or if ace do a good servo for
electric racing.

Any Ideas?