i saw them on tv today, and i thought it would be fun to have a little dirt bike. I am around 6 feet tall and i weigh 160 pounds and i a want one of the smaller ones, like i think they are 125 cc's, but i dont know.
If you are looking for a fairly cheap bike a that will fit you pretty well i would go with maybe around a 2000 2-stroke 125. This will especially be a good bike if you are just starting riding, and these days they are practically giving 2-strokes away
Fairly cheap bikes that will be good for you are: Yamaha TTR 230, Yamaha TT 225, Yamaha RT 180, Honda XR 200, Honda CRF 230, Kawasaki KDX 200, and Suzuki DR 200.