Before we finish the subject and the argument about which NSR is best...I have an MC18, and MC21 and an MC28.....and I am with fonty, the 28 gets the most attention whenever you pull up anywhere and is certainly the rarest and the trickest. But as Dave says, its horses for courses, if you want a trick (standard) road bike then the 28 is my favourite, if you want a track toy then its probably best to get the 18, if you want a mixture then get the 21......but thats only my opinion...each to their own I say!!!! At the end of the day they are all great bikes and its easy to argue the good and bad points of each of them.