I love taller horses. Because my discipline is barrel racing though, I'd say right around 15.0-16.0hh, give or take. (I'm 5'0"
) If I competed in something else, you'd see me on a 16.3hh+ horse.
When I was working at a rescue last summer, I LOVED playing with all of the OTTBs because they averaged right around 17hh.
(They were all jumpers... I don't know how to ride english, but I'd love to learn!)