I have a ZDZ in mine and agree with the above replies. Any good 2.4 would be nice. The ZDZ is great because it is light weight. If you put a lower pitch prop on it things will really smooth out for you. Mine with a 21x8 menz is nice and smooth blowing plenty of air over the surfaces but not generating too much speed. With the 20x10 it has outstanding vertical.

I don't think the G23 would fly it the way you want though. Go with a 2.4. I think the G45 would work but its about 2 pounds heavier than the ZDZ40 if I remember right.