My son currently rides a 2000 Polaris 500 xc. This sled handles like its on rails. I own a 2010 yamah vecter ltx gt. The only whey to keep up with him is to catch him on the straights. He races MX bikes in the summer so he is a challange on the trails. I would like to stay in the 600 cc motor and either polaris or yamaha.It would have to handle just as good or better for him to give up his old Polaris. Any suggestions?