I have the DP Edge w/ BME 50 up front very similar to the DA maybe slightly less power and weight and I have the DP Extra with an OS160FX. The BME is awsome power on the Edge and it weights in at about the same as the DP Extra at 14.5lbs. If you want to fly a plane that feels more like a jet turbine then put in the DA and manage your throttle. The OS 160 will fly it well for pattern and IMAC manouvers except Advanced IMAC where you need two flick rolls on the uplines the OS just wont pull the craft through that.

You do need to look into thrust angles with such a big prop I use a 22 x 8 MenzS I used a bit more right thrust and some are saying maybe more down thrus but I havent got that far yet still fine tuning her.

As far as Miloh's comment on vibration I have noticed that the modern Petrol engine have their vibration moments low down enough in the RPM range as to cause no serious effects to airframe either at idle rate i.e below the vibration moment or in flight where you are above the RPM that may cause vibration, indeed I think some big four stroke glow motors kick alot more than a well tuned petrol Engine.