The can am ds 90x is a good quad my son is 10 and he can ride it hard, piggy back shocks, disk brakes and a wider stance he can catch about 2' of air and not bottom out.
excellent all around quad they don't like water but a awesome trail & shallow mud holes. i got a 2001 500 with clutch kit, mud lites & mbrp pipe and i ride it more than my brute force 650i just my thought but i love the scrambler.