Hey Wayne Welcome aboard,
For starters the Mustang is about to be RHD so might want to steer clear until the dust settles. I learn't the hard way.
They tried to bring the Charger out here a few years ago and it did not really sell well the 300C sold better.
The Challenger, Corvette or Camaro are your best bet they start at about 120k new but cost anywhere from 25-35k to convert ,2nd hand value is around 70-80k.
Unless there older than 30 years they have to be converted to RHD.
It seems to me the classics are the best ( Mopar's,Chevy's, Shelby's etc ) way to go for investment in maintaining and increasing in value over the long run.