Does this mean I should put expensive american servos or cheap chinese servos in my chinese arf with the chinese engine???

Barry, try to get what the manufacture recommends. Myself, I dont run $150 a piece servos..Most of mine are the hitec 5645 digitals. Tehy run about 45 bucks a piece and have 172 oz of torque at 6 volts. I have a 33%sukhoi and have 1 for each elevator and 1 for each aileron. My rudder has a CHEAP CHINESE digital. The only reason I got it was because of the torque rating.. Needless to say, the plane will do knife edge loops on the CHEAP CHINESE digital...Now on the other hand, I bought some different cheap chinese servos, one of them failed on the ground when I was testing the plane out...Maybe just do a search on the different kinds of servos you are thinking of...Hope this helps you some.....