Firstly measure out how many hands you are thinking against yourself. 10.2cm = 1hh. Do you really know what the measurements are cos I found when I was looking to buy my boy peoples ideas of horse height are varied! Horse height is far from a guaranty of your confidence/safety and the attitude of the horse. In my experience bigger horses are quieter, trainers/owners have to have them that way, or you couldn't manage them. Still, for a beginner bigger horses will intimidate you on the ground, which they will VERY quickly pick up on. Paints over 16hh are harder to come by which = more$. Regardless I think a TRUE 15.2 – 15.3hh mussly horse will fit nicely.
Good luck :)