What are disipline are you planning to do?
I think you could go with a horse between 13.3hh - 15.2hh, but it's totally your choice.
And, the a few very versitile breeds are Quarter Horses, Morgans and Arabians.
Good luck with your horse hunt!
[quote="Momo"]I am a petite young woman of 5'1". I am thinking about starting to ride seriously, and I was wondering what would be a good breed for someone of my stature?
Apart petite or not petit (This is not only the question) you have to think your level and your preference. An andalusian could be very good, excep if you like jumping better than dressage or have a walk. An Arab would be good as well.
Sorry but English is not my first languaje.