Hello welcome bk to the horsey world!
What kind of horse did you use to ride? I think Vidaloco's article is a good one. (Hi Vidaloco
) I'm 5'7" and I feel I look strange on anything smaller than 16.2hh. Mind you a lot of people would disagree. I wounldn't put you on anything smaller than 17hh, & 900kg. Not if you are going to be riding it permanatly. Some sort of heavy breed, and they are becoming more versital in looks, can get more leaner eligent looking types now, while still keeping the strenght. I would give this advise to all new buyers, do some reading on conformation it will help you no end. Personally I love heavier breeds! The bigger the better! They are beautiful and usually have wonderful temperaments.