Ok. It's decided.

Ailerone. I have 2 HS-605 on the wing. Original red arm is to short, so I used "Dubro Servo Arms Long" and home made CF pushrods. Looks OK for me, but in the future I might put something better.

Rudder. One Hitec HS-945MGS in pul-pul (kevlar). I think, I know finally what the spring is for. I see two main reasons:
1. If linkage snaps the pushrod connector will not swing around free, but will stay in the same place. This will prevent from locking that servo and will keep connector away from other servos.
2. It looks like the servo arm is a little bigger than rudder horns, so the spring is keeping both lines closer and reducing the slack. It's pretty coll because in example when servo turns rudder right the kevlar is keeping it hard against the wind, but the spring allows the rudder to turn a little more left. I think this saves the servo in turbulent airflow around the rudder. I will keep it that way.

Elevator. Two Hitec HS-625MG with push-pul CF tubes. It's stiff, strong and light (I love CF). Becuse I will keep both servos under the cockpit I will not need servo extensions. Again, I see that red arms are to short, so I will use the same "Dubro Servo Arms Long".

Chuck, thank you for your help.

RysiuM