Incredible bike, I have had the '05 and '06 model. The '05 has a totally different power delivery than any year after it. It arguably has the best engine of any CRF250R made. The '05 has more low end power compared to the '06 which is more of a mid-range power band. The '05 is not dual exhaust though, that started in 2006. This bike is much faster than a 150R and your height is fine. My nephew is 5'4" and riding the CRF250R. Enjoy