ORIGINAL: Diablo-RCU
If it's a 3W or DA-100, I'd use a Menz-S 27x10 for 3D. Great pull, and quick acceleration because it's a light wood prop. The prop can be noisy in straight and level flight if you let it unload and rip. This prop will turn 6400-6700 rpm static on these engines.
I agree, I have been flying with 27-10 now. The 3W and Menz work well. I have tried the NX, but not quite as much pull. The NX 28-10 works pretty good for 3D stuff.