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My set up is Webra 91 AAR with MC carb, 9252 on cyclic and collective, 2 robbe FS250T for the MC carb, Gy 601+9251 and GV1.
9202 will be fine unless you do hard 3D: if that's the case then maybe you'd like faster and more powerfull servos such as the 9252.
As for the engine If you want to go OS the go with the new PS as it should be more consistent and a little bit more powerfull the the standard c-spec.
Do you have the new 90STD kit or just a 60 upgraded?
Have a nice day