I am 6ft and 14.5 stone in my riding gear and ride a CRF230F.
Before the CRF I had a Yamaha WR250F and first rode the Honda abroad while I owned the Yamaha. My first reaction was it was a toy. At the end of the first days riding I was so impressed with it, I had managed some technical riding that I could not have done on the Yamaha.
On my bike I needed to raise the bars and fitted first put 20mm bar risers on. This wasn't enough and I put Dakar bars on (taller and pull back) to feel comfortable. Putting the Dakar bars on required new (longer) throttle and clutch cables and a new brake hose. You might feel comfortable with just bar risers. The suspension is also lacking. I have changed the rear shock and have "emulators" to fit to the front forks (a friend of mine has them on his CRF and confirms they make enough of a difference to make it worthwhile fitting them).
They are not the fastest bike around but are honest and reliable. The CRF is a popular bike in USA, Brazil and Australia so there is loads of information available on the web.
Hope this helps