I went in circles trying to find a great nursing shoe. My previous shoe was a walking shoe from Famous Footwear and although it worked great with a special arch support, it wore out quickly in the toe area and without an insert it was hell on 12 hours. :angryfire
Recently after trying on every shoe in the store, and being on a limited budget, I bought Nurse mates. They are not the cutsie ones with the strap or flowers, but more or less a slip on leather upper with great arch support. I can honestly say they are the best mid-range nursing shoe I have worn. After 12 hours, I can feel my feet are still comforted and supported. Its like I'm walking around in heavy, cotton socks but with major arch, heel and toe support.
Check them out, and most importantly, wear the socks you wear normally, and walk around as long as you need in the shoe store. Make sure there is nothing you can feel wrong with them. They are one of the most important things to a nurse.