Like Neet said, there's usually a thread running on one of the boards here on this same subject. Ask ten nurses/students, get ten opinions
Frankly, it doesn't matter what anyone else finds comfortable, or "wouldn't go to work without" on their feet. What's comfortable for YOUR feet is what matters, and polling others doesn't seem to bring you any closer to that decision, IMHO.
I found the best, most comfortable shoes ever on my local Wal-Mart shelf for $18; I had "upgraded" from the $10 variety <grin>. I tried a recommended, pricey pair at the uniform shop and they felt awkward, definitely not worth the bucks to me. It's all a personal choice, so try some on!