Suposedly the fastest is the lA 9 Lavochkin
http://owen2.otago.ac.nz/owen/XuAir2004/LA9.html
372 Knots @ 17,000'
FG1D (The NZ Corsair) 369 Knots @ 20,000'
The Thunder Mustang Vmo 222 Knots Vne 437 Knots.
It all depends on how you hold your mouth (and who is telling the story), and of course none of them are Turbo props
