I am building a Moass 60 also. Futaba S3050 is what I plan to use all around (HS-85BB for throttle). Power for the servos will be a 3S lipo running through a Castle BEC http://www.castlecreations.com/products/cc_bec.html with the output voltage set at 6V. I choose these servos because of there weight, the higher output servos weight quite a bit more.

Keep in mind that even if you run 150oz servos but your battery voltage drops when the servos are under load you will have a huge drop in output power. It requires a substantial battery to power the HO servos.

My 40 sized Mojo was having blowback problems with my 6V nicd battery. Switching to the Lipo - BEC running at 6V cured the problem and also reduced weight.

Ryan