Dansko's or Sanita (same shoes)! I've been a nurse for over 10 years and have tried just about every "nursing" type shoe under the sun.
I've found that when I started and was wearing running shoe or athletic type shoes, the support would wear out pretty quickly. I found myself replacing even the best brand shoes every year, or I would need to invenst in about 3 pairs at a time to rotate them. I also found that my feet would sweat in them more then leather shoes.
So about 6 years ago I switched to Dansko's. There is a "breaking in" period which I figured is better to do walking around in them in your house. After about two weeks time, they are good to go. I've had the same few pairs of Dansko's since then and they are all still in great shape.
They have great arch support and they are leather, so they breathe. They also have an anti-microbal insole, which is impressive.
Plus just a bonus for me...the rocker soles make you about 1 1/2 inches taller, which is great for a shorty 5'4 like me!
If you are interested in Dansko's or Sanita's, find a store in your area and try on a few pairs to find your right size. They usually retail from about $110.00 to over 200.00 for limited edition ones. Instead, after you've found your size, go to ebay and buy them there.
I've picked up alot of New in the box Dankso's for 60-70.00. Well worth it!
BTW...go home at night and put your feet up if you can for at least 20 minutes...that helps more then anything!