If Canada isn't too much of a stretch, besides the two that Phoenix Farm mentioned, take a look at Ilian de Taute.
From dealing with Ilian himself, I can say he definitely has the temperament you are looking for. Total gentleman in every respect. Not cold per se, but you have to deliberately rev the engine to get the blood. The handful of his kids (and one grand kid) that I know are super easy going individuals. He is not a huge guy, but again, all the offspring I know were bigger than him (including 2 17+handers out of TB or TBx mares).