Let me chime in with a vote for the Danskos. I've had the Mens Professional model with the closed heel for about a month. I wish I'd had them last year during my countless hours in the OR retracting.
Make sure they fit right -- they're supposed to be very loose and not touch your heal. Try them on at an authorized retailer to get the size right. They take a couple of days to get used to, but your feet will thank you. The only problem I have is that I've nearly sprained my ankle several times, I guess because of the tall heel. They're definitely not a good shoe for running down the hallway.