Join Date: Feb 2012
Location: Alberta, Canada
It depends partially on what your doing. Are you trail riding? If so, a horse you can mount from the ground is an asset. I stay under 16hh.
If not, then just find a horse you like, that does what you want, and be happy. My cousin is 5'2" and her main saddle horse is 18hh. A friend is 5'2" and her main mount is 14.2hh. My BO is nearly 6' and she rides anything from 14hh ponies to 17.2hh ottb's.
Ride what you love, and at your weight, don't worry about size.