Find out what type of trails your going to be riding otherwise you won't make a good choice. I have both Rincon and 450R, I ride the 450 on the same trails as Rincon I just stay away from big hills and spots where I can't turn around(no reverse on the 450). The kfx/z400 is a great choice I go through mud all the time on purpose. The biggest prob you'll have is your rear getting stuck where the 4x4s went deep. Good luck.