You know you can't ride those on the street legally right? therefore, you need to haul it to a track competitively or non...
I dunno how old or how big you are, but, if you're looking to get a motorcycle, i dont know if this is the best approximation. I'd go with a ninja 250 or something, that way it's at least street legal, and good to learn on. you can pick a used one up for pretty cheap too