The control surfaces on this plane are relatively small.

That means there is normally not a lot of torque due to the air, on the surface and servo.

You might even get away with standard servos if you configure the linkages for maximum mechanical advantage.

However if you want to play it safe and keep the costs down, you could use a high torque inexpensive servo such as the Hextronics 5010's ( approximately 9.00/ea ) which produce about 130oz/in or more of torque.

Given the thin wings and weight of the plane, you'll want to go with beefy landing gear, preferably of the shock absorbing variety.
You'll want something that will help prevent the gear from ripping out due to impact....

e.g. either sprung wire gear, or gear with an offset scissor type shock absorber that deflect back and up on impact.

I don't have this plane and I do not believe the elevator uses two servos, rather the other servos are allocated to each of the retracts. If you use pneumatic retracts you will not need so many.