it should be considered that the Westland Lynx holds the official world speed record for helicopters.

A Westland Lynx, one with different engines, rotors, stripped of weight etc

A standard production Lynx is comparible to many other helicopters available, but they certainly are a very nice piece of kit indeed, a quick Youtube search brings up some nice clips 🙂

http://www.youtube.com/watch?v=wLejE5vfV_o