One of these would be my first bike ever buying, ive droven a dirtbike before, know how to ride and hadle it and all that stuff, bikes for 15 year old about 150 pounds ? .. i just mentioned the 480 because id probably get bored of a 125 very quick, and could just save acupple bucks in the short run, just because id have that power doesn't mean im gonna use it all at once .