If you think you can handle the height ( which at 5 foot 6 you shouldn't have to much of a problem...shorter people than you have gotten these bikes) you should look into a KDX 200/220. They are great bikes to mess around with out in fields, on the trails and can hold their own on the track. They weigh about 223 pounds dry, that may sound heavy but I am only a little bit bigger than you and I have no problem with it. The best thing about a bike like this is that you won't grow out of it., it is the kind of bike that can grow with you. It is an awesome bike stock, but if you want to trick it out it can become an absolute monster. You won't find the power unmanagable, but there is always enough for whatever you want to do. Up here in Canada I don't think you can get the KDX 200 so I can't tell you a whole lot about it...this is basically what I know. The KDX 200 many people say feels faster...that's probably because it doesn't have as much low end. This bike will rev out more than the 220. While the 220 ( this is what I have and I love it) is a torquey monster compared to the 200 and the 2 stroke mx bikes out there(the kdx's are 2 stokes by the way). It is still fast, mine will go over 100 km/h and it is bone stock. It can handle anything I throw at it. It has more than enough power to do whatever I want with it...but the power doesn't hit hard enough to get me into trouble. Both the 220 and 200 weigh the same...and look the same...the only difference is that the 220 is about 500 dollars more and has a smaller carb ( which can be changed). I really think if you feel comfortable sitting on this bike you should get it. It would be the perfect all around bike for you that you wont have to sell right away when you grow 5 inches ( I doubt you would have your 80/100 3 months before you outgrow it...i'd give it a riding season at the most) Put some thought into getting this bike...if you go new they are reasonable priced for what you are getting...if you go used..there are tons of good deals out there on bikes that are in perfect condition and only have a season or two on them.