I heard Polaris isn't making the 570 anymore so next option is the 50" Trail 900. I myself like the idea of being able to explore tighter 50" trails vs being stuck on only wide Jeep trails. It's a pretty capable machine in stock form.
It seems some buy their kids the 570, it's a real machine that goes pretty fast and can do a lot. I don't know it all depends on the person hard for me to say not knowing you.