ive had 2 motorcycles in my life so far, one being a ttr 225 and then a kf250f. i went to a motocross school with the kawi and i ride all the time in the bush and such so i consider myself a pretty good rider. im 17 and im 6 ft 3 and weigh 170 pounds. the question though is that im looking to buy a street legal bike, most likely a sport bike. ive never driven one before but i think ill be able to handle it pretty well as i could handle a motocross bike. what would be the best size to get first? i dont wanna grow out of it in a week then want more power but i dont want too much at first. also i live in the bush on a 1 km packed gravel road, that wont be too much of a problem for a street bike would it?