I wear a pair of Ariat mens' work boots, although they don't really look like them... They look more like riding boots, but they're extremely durable and they actually fit in my stirrups without a problem, (well, as little as a problem as you can manage when you have feet like mine.
I have ridiculously wide feet; I could wear about an eight in women's if it weren't for how wide they are, so I actually wear a 10 in mens' boots. I like my Ariats because they're wide enough to be comfortable but are still alright to ride in. The only problem is that my legs have gotten even more muscular from how heavy the things are!