actually there are 7....that I know of.
the 1 (PA31T-1
the 1A (PA31T-1)
the 2 (PA31T-II, was the ORIGINAL cheyenne)
the 2 XL (PA31T-IIXL)
the 3 (PA42)
the 3 A (PA42)
the 400LS (PA42-1000) (thats the Garretpowered rocket version)
Plus some conversion (from Canada?)
I guess we would be talking about the 1 or 1A ? These are not bad personal transports...have flown the 1A and the 2 many, many moons ago.