How about a Flip 3D with that YS 45. The Flip is a pure 3D plane. If you want to learn to hover, then the small UCD with the YS 45.

You pick up an advantage with the YS, it has a pump, allowing the tank to sit on the CG. Where alot of people run into problems with their 1st 3D bird, is balance. To get them real tricky, they move the CG back, however it becomes so squirly it is difficult to land. The YS with the pump solves the problem.

I do not find the scale looking planes are very good 3D plane, until you get to the 120 size birds and larger. It comes down to a power to weight issue. The scale birds are nice looking, however heavy compared to a pure 3D plane or Profile.

You may not like the look of a Profile, however they will teach you alot, kinda how a Stick teachs you things a trainer will not. Just pick a profile, it really doesn't matter now.

On the prop question, since I'm already typing...........APC 11-4 is a great prop. Also try the 11.5-4 APC. It has a wide blade and spins up fast and throws a little more air than the 11-4. For pure hovering, the APC 12.25-3.75 works great. As mentioned before, it takes time to spool up, but you may be able to put the transmitter down and the plane may just hang there.

Based off the motors you currently own, the YS 45 would be the best possible 3D motor. I ran one on a ZN Line Madness and it did great. The Madness is no longer available, however the Flip is it's Brother.

Madness 5.5 lbs with a YS 45 on the YS pipe, 30% Heli fuel, APC 11.5-4. And the Flip is flying with a Irvine 53 or OS 50 Heli, don't remeber, about the same weight, APC 12.25-3.75.