David,

Personally I would put in 100in/oz metal gear servos for all the control surfaces. Your not going to be doing any knife edge or torque rolls so these should provide plenty of holding power. I would do a little investigating and see what others have done with similar size/weight models before you make your choices.

(2) Elevator for a total of 200in/oz
(2) For rudders
(2) for ailerons
(4) For the large fowler flaps (2) each flap
(4) standard throttle
(1) 70-80in/oz on the nose gear (metal gear)
(1) standard on the gear and sequencing door valves (if your using them)


You may be able to get away with less, but why take the chance with an investment like this.