I am looking at getting a rzr (probably used) and am wondering the difference between the 570 and 900. To give you my situation, I am buying my wife a pitster pro 200 (she is 5ft tall and 95 lbs and can't reach the pedals of a normal sized rzr) and I will get a bigger one. She will take one of our kids and I will take 2 kids with me using a bump seat most likely. I am 6ft 1in and 170 lbs. Would the 570 be enough to drive around and have fun?