well how much money do you have to spend and what years are you looking at? ALso if you are riding mostly fields you may want to get a 4 stroke cause they are better in fields than 2 strokes are. If you are in tight trails alot get a 2 stroke. I am 15, 5'9 and 135 pounds. I just got a kawasaki kdx220. This bike is kinda big for me. The thing is the motocross bikes have a very high seat height. So you want to get a 2 stroke trail bike( like what i have ) or a 4 stroke trail bike. I would look at the honda crf150, honda crf 230 or the yamaha tt225. These are all good bikes. Do you want a 2stroke or a 4 stroke more??