Some years ago, we flew Rookies and other jets with JR and Futaba servos not as good as the current Spektrum, Savox, etc... and also used the Du-Bro heavy duty plastic servo arms, and Sullivan metal links.. (wich are still my favorites) . Correct geometry applied with good quality hardware is far more important that the "bling" factor, IMO.

Metal arms are great for 3D gassers who need long and rigid servo arms for gigantic surface movements. Use one of this long ones on jets and soon you will realize that is not a good idea. And even if you think about using a short metal servo arm , remember that the servo case is made of plastic, and the servo mount in the wing and fuse is not attached in anything "metal rigid" either..

By the way, congrats to your wife .. she is wise!