All you need to know about the 125...

125 cbr Honda

OK, so Im not so keen on the 4 Stroke 125s. They are a bit slow, and they dont look as good as the others. All IMHO, of course ;).

However, I had a spin on a CBR125 and it was actually pretty good, provided it is only really used inner city. They have far more torque than any 2T I have ridden, and they are very nippy at low (-40mph) speeds.