yeh but they cost a fortune, its not only the handling capability of a 125 hillz, its im not that tall and mi feet wouldn't touch the ground, also things like they design the gear shifter and clutch levers for ppl with bigger feet and hands, i have very big feet for mi age, im like a size 8 or 9 but mi hands aren't that big... if i ccan test some bikes then i'll give a 125 a shot and see what i reckon, but i could always keep the 85 for say 2 - 3 years, sell it for around 3k and by then i would hav enough cash for a 125 miself.
EDIT: oh yeh and do u guys kno if the yz125 has an adjustable shock, if u can adjust the seat height down from 99cm to say around 90 or just under then i could just fit on it.