I second Tiny's suggestion of Ariats. I have flat feet and very wide feet (when I used to buy Justin Ropers, I would get a EE width and still get pinched) and, due to spending too many years walking and running on concrete in crappy tactical boots, I have foot problems including bone spurs and tendinitis.
Ariats are the only boots I've found that are comfortable for me to wear. Oh, and one little piece of advice, if you have a normal or narrow foot, you may want to go with the round toe like the ones Tiny posted. I used to have a pair of those but they were still quite a bit too narrow. If you have a wider foot, you might look into the broad square toe like this Professional Quickdraw 11" - Ariat
Those are the ones that I have been wearing daily for almost 3 years and they are still in pretty dang good shape, considering. I can walk or stand or ride in those all day long and I end the day just as comfortable as I started it.