Not to push for Arabians [although they are my breed of choice...haha], but I think you would truly be surprised at how some of them take up your leg.I also prefer a larger bodied horse - Friesian, Warmblood, Andalusian. I'm 5'8 and don't like feeling like an amazon woman on my horse.
Sure, there are those spindly-legged halter horses that are narrower than a fence rail, BUT that's only one variety.
I prefer Polish-bred Arabians. As a group, they are known for being some of the bigger bodied Arabians.
My last mare was 14.1 on a tall day and I'm 5'7", yet I never looked [or felt] overly big on her. Looking back, I think I *looked* a little big just because my upper half seems to be looming over her...but no one ever commented and neither of us was ever uncomfortable:
[this was taken during a costume day at a summer camp we worked at...we were twins for the day. haha]
My current gelding is narrower than my mare was, but he's 15.2ish and Polish/Crabbet bred.
Again, he takes up my leg quite nicely:
My mare DID move like a little horse. She had shorter strides, quicker turns, she was definitely little. You asked her to do something and practically before you got all the words out, she was doing what you asked.
My gelding, on the other hand, moves like a horse much bigger than he is. Perhaps it's because he has unnaturally large feet [I have never seen such big hooves on a "normal" sized horse!], perhaps it's because he has unnaturally long legs, but he moves like a big horse.
I've measured him out and, if it weren't for those legs of his, he'd be basically the same size as my 14.1 mare. He weighs the same as she always did, same blanket size..but he's over a hand taller.
At the same time, I have no idea how he is as athletic as he is. He changes leads out in the pasture, and there's this terrifying, but daily, event:
How does he avoid running smack into that fence? Magic?? I honestly don't know.
I get that you aren't into Arabians and I totally understand that - they aren't everyone's cup of tea!
All I'm trying to say is that you don't have to have a warmblood to get that solid build, or that nice movement, or that "big horse feel."
It's ok if you absolutely prefer warmbloods, totally ok, but don't limit yourself unnecessarily.
For all that, a friend of mine [tall friend, she's taller than me, at least 5'8"] participated heavily in OHSET [Oregon High School Equestrian Team] as a teenager and got some of the best fourth level scores OHSET had seen. What was she riding?
A Paint gelding with unremarkable bloodlines.
Anyway, I'll stop beating a dead horse now... haha *slinks off*