RE: Which plane?
I wouldn't suggest any of those because you'd likely be biting off more than you can chew.
Scale Aerobatic models (Extra, Edge, Katana)in the.50 sizes tend to be very heavy for their size andtip stall very easilywhich can catch an unaware pilot very quickly. They're a lot better as the size increases but still not a great second plane.
I would recommend eithera Stick like the UltraStick or Big Stick or a low wing sports model like the SIG Four Star, Hangar 9 Pulse XT, Carl Goldberg Tiger and maybe the new Great Planes Escapade. All of the above, with the exception of the Escapade come in .40, .60 and sometimes 1.20 sizes.
My club really like the World Models Mach II and use it as an all-rounder. It's designated as a low wing trainer but they use them for everything.
Like you i was an accomplished heli pilot before i flew fixed wing seriously.
My first plane was a Four Star .40 and it was a brilliant plane to improve the skills but can also be quite a decent performer when you advance further.
P.S. I just saw you're also from Australia. If you're fromSydney i've got a great low wing sports plane currently for sale. It's advertised on RC Trader . com .au if you're interested.</p>