RE: 3D PROFILE NITRO
If you need an ARF, the selection is very limited.
MoJo is a kit but a very easy build and a great place to start.
The Sabre from valuehobby.com is a great ARF for the 55AX.
The Chinn Yak from EF is a good flier but not necessarily a beginner 3D and is pretty fragile.