I would stay with a single stage myself. It will actually make for a more correct look, and its plenty durable--wax it once in awhile. I would also compare a few actual samples, Panther Pink is a color that if slightly white washed looks horrible (and I have seen several cars that end up this way) but if its intense enough (blues and black tint toners) is really cool. Different paints WILL have slighly different appearances.

Back in 1994 I actually had Sherwin Williams Automotive custom blend my own version (slightly more black) to acheive the look I wanted. Its a pain, and I wouldn't recommend it for a 'correct' FM3 car, but it makes for a GREAT look.