I just bought a Parkzone T-28 Trojan as a second plane while my Sig 4* is still getting built. Look into this for an aileron trainer. It is really docile because the wings have some good dihedral in them. But it can also do some pretty good aerobatics. I have never flown inverted before and it came pretty easily with this plane. Rolls and loops are easy and Immelmans and Split S's as well. My first plane was a glow 60 size trainer and I bought the T-28 plane as an after work park flyer.

If you do get the T-28, right when you get it, pop the main wheel gear holders off and epoxy them onto the wings. The glue they come with is not very strong and they will pop off on a less than perfect landing.