I hate to disagree, even respectfully, with someone who so nicely agreed with me; but I'm afraid I must.
Heart will get you a long way in a lot of disciplines, jumpers included, but in hunters, the horse must move like a hunter, jump in good form and nail 8 spots and two changes while looking relaxed, happy and elegant. All the heart in the world won't get a horse pinned if they routinely add a stride, hang a knee, blow a change or don't look the part.
Jumpers? Yes, heart and "want to" will trump looks and atheltic ability until the fences get pretty big. Eventing as well, until you get to Prelim and above.
OP, he's a good looking guy in any case. Why don't you wait until he grows up a little and let him tell you what he wants to do?