I use the Savöx SC-1256TG (=equal to Team Orion Vortex VDS2015) on steering. (20kg/cm - 0.15sec @6V)
And a Savöx SC-1258 TG (= equal to Team Orion Vortex VDS-1409) on the break/throtlle (12kg/0.08sec).
Both are great servos for a great price, ideal for buggies and truggies. Powerfull and fast!