Go and google what the PTS in the mustang PTS stands for rather than asking everyone else.......

Andrew, I dont want to rain on your parade.. but I'd get realistic about your second plane.

Chances are your going to crash it.
I'd say more likely than your trainer.

The trainer is used to learn the very basics, and so doesnt really get exposed to too much "dangerous flying" but as you get your second plane, you'll start to try and see what IT and You can do...
Ie.. some days it goes wrong.

Dont go for expensive or pretty...

Go for "temporary and functional" get a Phoenix Dolphin, 4*, Kyosho calmato sports etc and abuse the hell out of it.... finnish with it THEN take the radio gear out and put it into something pretty.....

I got the dolphin as a 2nd plane and its always in the car when i go to fly, because its "disposable" I take it out to practice nasty manouvers or generally go lower and faster than i would with a better plane.. it was €120 I can buy 3 replacements a month if i wish.... so who cares.