Hi,
Had a chance to see the H9 PTS P-51 this week. And its OK I guess if you need a trainer that noses over on every landing and flys faster than any trainer should. I think it would be a very fine 2nd plane though. It is not a plane most new guys can fix.
Good luck with the F4U. If there are any youngster around flying on a budget they will love the free hardware and salvageable pieces.
LOL I realize your gettin' a bit of a hard time here but these guys run into this at least daily. They do want you to do well in RC and they see so many quit when their first or second plane becomes a rather pricey pile of tooth pics. some people can pick this hobby up faster than others IF they put in a LOT of stick time (sims are nice but it is NOT the same) real time with planes in the air is what it will take.
Fly that trainer as much as possible WITH AN INSTRUCTOR, solo, and then decide what your next plane shoud be.

Be safe and have fun this is a greatt hobby.