Another vote for Ariats! Love them! They last forever and I have purchased a few used pairs off of ebay for cheap and they are still in great condition.
I would suggest that you consider a boot that will slip off of your foot if you get caught in the stirrup. I have been riding for many years and have fallen off more times then I can count. However, just a few months ago my horse tripped and fell to his knees. I went flying forward but my foot stayed stuck in the stirrup. I was wearing my lace up Ariats. I was hanging off the side of my horse and my boot would not come out of the stirrup and my foot would not come out of the boot. Not to be dramatic, but honestly, at the last second before my horse totally blew up, my boot came loose and I fell out of the way as my horse went bucking off. If my boot had not come out of the stirrup at that moment, I think things would have ended very badly. I was riding in a western saddle. This is the only time that anything like that has ever happened to me, but I will never again ride in a boot that will not slip off of my foot in that type of situation.