A CBF 125
Just got hold of a nice one at a bargain price for my son, using it myself while I wait for a rear bearing to turn up for the SV - rear suspension has finally given up after 4 years of advises for increasing play
As long as you keep firmly in mind that it's a little 125, it's surprisingly decent, especially once you hit the smoke, where you can't use a bike's top speed in any case!