I like Keen and Danner for work boots. Keen typically has the lighter more flexible sole (EVA or similar foam style as in running shoes). I have the Detroit model for a light summer work shoe, but it is not all leather, so it is not good for snow or very cold conditions. The Pittsburg model is a bit more robust and both come in plain toe or safety toe.
The Danners I have are the 6" Corvalis which is a medium weight boot with Goretex liner and is great for most work in all but the worst conditions. My heavy boot is the 8" Quarry model which is thick all-leather and very robust. I use it for snow and working with rock and timber. Great ankle support. Both have safety toes although they might be available with plain toe as well. The Rain Forest model is even more sturdy for professional work in the woods (short of caulks--pronounced as "corks"). These all have heavy welted soles that are stiffer than the EVA ones in the Keen models which are overkill for working around the house, but welcome in protecting your feet amongst rocks and heavy wood. I think all Danner models above $250 or so are USA made, wheres lower priced models are made in China, etc like most boot brands.
I have had these boots for 5-10 years and they are holding up well. I haven't needed the Quarry boots for a while so they are in great shape. The Corvalis and Detroit boots get daily wear and abuse (mud, job site, yard work, firewood) and they are still in good shape. The Detroit soles are starting to get nicks in them as it is a softer sole than the heavier Corvalis. Sharp broken rocks, metal edges, etc can cut up fabric boots quickly, but good leather will withstand those working boot cuts much, much better.
For year-round use in one boot (not including snow) you might look at the Danner Corvalis or Keen Pittsburg. There are plenty of other good boot brands as well. I have Solomon trail shoes that are fantastic so I imagine their boots are excellent as well.
