Is there alot of difference between a 2003 CR125 and a 2006 CRF250R?? I ask because my brother wants to get a CR250R or a CRF450R but I think its too much for him. I have a 2000 RM250 and its too much. Would the CRF250r be enough? He is still a very novice rider if that helps. Thanks for any imput.