CJRacer,
The kit manual call for std servos, or if opt for a larger engine to use 70 oz servos, I think 70 oz servos is a good recomendation. Dont know if you have read other entries of this plane but one is claiming Saito 150 for a perfect match. Well I guess it is all down to flying weight and personal preferance.
Myself had a look at the root wing ribs and though them to be a bit on the robust side, so I slughtered them a tad... (I hope I didn't take off too much

...d*m dremel).
Initial weight; 45 grams= 1,59 oz
Final weight; 20 grams= 0,71 oz
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Saved weight 25 grams= 0,88 oz (or 55%)