I am getting my motorcycle license very soon and looking for a bike. I like ninja's but aren't sure what size I need. I'm average height/weight...well 5'6 so i need a low bike. I have looked at all the ninjas available but really need to know if it would be enough power for a first bike. If not, would the next one up be too much? If you've rode them or know about them, please let me know! Thanks!