Looking at getting a sled for my girlfriend but not sure what to do for size. Found a decent deal on a 2007 Polaris 600 with a 142 track. Is the what I should be looking for? She’s about 120lbs, will be mountain riding in Colorado. Not a super aggressive rider, but she will be boondocking. She used to have a 2002 mountain cat 151. Does she need the 800 151+ track or with her weight will the smaller engine and track be better?