Hi colyn
Yes i have one of these with an OS1.60fx. This engine is excellent power option for the CA 2m. Will keep it extremely light and will fly perfect. Just remember to mount th levator servo's in the front and run a Dowel/pushrod combo with a Y to the 2 elevator halves. For this choose a hi-torque metal geared servo. The above setup will give you a model at approx 11.25 Pounds. It will be the best flying you will ever do. Also you do not have to go through the cost of the DA version. The only caveat is that this power combination is adequate for a IMAC routine, if you plan to fly 3D, you will have to opt for a heavier Gas engine.

Regards
Ravi