The 1.60 FX will fly it very nicely. I had a 1.50 saito in mine and it flew it pretty good. It would hang it at about 3/4 throttle but not pull out. It was pretty quick and about 11.5 lbs. with the 1.50
I think you would be unhappy with the DA 50 on it. I also own a DA 50 and I think it would shake this plane apart. Also I used 1 servo for rudder and 1 for elevator with pull pull. I'd have to go down in the basement to look and see what servos they are as I can't remember but I do know they were 185oz digitals and I rung it out pretty good with them. never fluttered. DAM nice flyier you will love it.

Miloh.