For your use case, i'd recommend Mephisto comfort shoes - specifically their match model - click on the black version, which is what you'll be interested in. Also, take note of the fact that there are 87 reviews with an average of 5 stars. I think you'll be hard pressed to find a site that doesn't have overwhelmingly positive reviews of Mephisto Match. Check them out on Amazon (100+ reviews) as they're under $300. I think with a little googling, you can likely find a better deal. My father is a big time Mephisto fan, and he gets most of his on eBay - and has had good luck finding new pairs for under $200, and in some instances under $100.
Over a decade ago I used to wear Mephisto Matches when I spent 8+ hours a day on my feet and walked about 5-6 miles (round trip) to and from class. Foot, knee, leg and back pain were non-existent. If I needed to spend extended hours on my feet again, Mephisto is the first, and last place i'd look.
Hope this helps.
I second the Mephistos. They are great shoes. Mephisto will refurbish them for a about $90 and you will think you have brand new shoes!