bought a pair of Ariat Sierra's (#10004986). They're pull on men's western work boot with a roper's toe, so they're not very wide. I actually just measured them, and they are almost the same width as my Ariat Heritage english tall boots. Sole to sole, they are just bare millimeters wider. They have the no slip rubber sole, and they have the required heel to ride in. My pair in particular doesn't have the steel toe or the composite toe, so they aren't super heavy. They are heavier than my Heritage english tall boot, but they weigh about the same as my Dublin River Boots (Irish muck boot knock offs). I actually rode in them for the first time today, and I didn't have any issues with them in english stirrups. Even with the no slip sole, I didn't have issues kicking my stirrups off, and I found them quite (very very super duper) comfortable to ride in.
I'm really happy with the purchase, and cannot wait to finish breaking them in. They be some stiff boots still. I tried on a lot of Justins, because that is what most stores carry. But I find the Ariat brand far superior. They're more comfortable, and I actually found a pair to fit my very difficult to fit foot.