Thanks for all the suggestions, everyone! I just wanted to post a quick little update on my horse search - I found one and he's coming home next Saturday! I'll post a real introduction thread with pictures when he arrives, but for now, I'll tell you he's not at all what I was looking for. I went to look at him out of pure curiosity and I just fell in love. He and I just clicked.
HE is a yearling Quarter Horse gelding. Much younger than I would have liked, but very calm and I've already enlisted a trainer to help me out. I didn't plan to get on any horse until mid-next year anyway, so I don't mind the fact he's young. He's red dun (including the dorsal stripe and tiger/zebra striping on the legs) and about 14hh tall. His dam is 16.0hh tall, so I imagine he'll end up somewhere in that range. He's built very solidly, and has fairly decent ground manners for a baby - a little pushy, but that can be fixed.