Whites, Danners, Vibergs, and a couple others. They are all the tops, and most expensive for darn good reason. As with most everything; you get what you pay for. I've had a custom dipped pair of Vibergs for about 6 years now. They were so good after 4 years; I went and paid the $400 for a backup set. I've worn the new set twice.
My Vibergs are by far the most comfortable "shoes" I have ever owned, and even the 12 eyelets doesn't compell me to often wear other things. After 6 years, I'm finally getting to the point that I should get around to getting them resouled. I'd bet they'd last another 2 without doing that. If you look at the time that these boots have lasted me; I'll be getting away cheap for footwear. Take care of them, and they'll take care of you. I use Obenaufs, and Kiwi like a mother, and it's actually pretty hard to tell my new set from my old set without looking at the souls.
Another thing you may want to consider is composite toes. My Vibergs are CF toes, and after having them; I wouldn't ever consider getting steel toes again. Steel is great, but, it does have its' downfalls. Aside from the theory of: What if something REALLLLLLLY heavy ever falls on my toes? IE The steel toes act as an apendage shear... theory. I would like to point out the more realistic aspects of composite toes over steel toes. Anyone whos had that many pairs of steel toed boots knows that they aren't the most ideal for this time of year, especially once the snow hits the ground. Much time walking around in snow with the steel toes, and conduction turns into a frosty B****. Even with really good socks. Composites like CF, and some plastics don't transfer the cold quite so harshly. The other aspect is weight. Not like a set of steel toes is going to kill you, but, I'm all about the research, and my Vibergs are stupid light. Even with heavy gram leather, and reinforcement shanks; they are some of the lightest boots around. So anyways, just wanted to point out a few more things. Do some research, and buy the best boot available for you. The Vibergs were definitely the best available for me, and the shape of my hoof. I'd heavily recommend them to anyone looking for an amazingly well built boot.