Hitec 545's are more precise than 605's. The pot and cicuitry are not as accurate in the 605 and won't center as well (per tech at Hitec). My own experience backs this up. If you're running 2 servos in the tail for the elevators you don't need all that torque. 425's would probably be fine especially if you don't go with 3D throws and keep the servo with a short arm and a mechanical advantage. That would still give you 86 oz combined on the elevator. Goin' 3D, 545's are plenty. 100 oz on the rudder is good.