I have spent a small fortune in the quest for comfortable shoes and here's my verdict:
1st-Conker shoes. I bought the pull on boots with the poppers and vibram wedge sole. They are without a doubt the best shoes I have ever had. The leather is of a far superior quality, they are neat on the foot and they are really bouncy underfoot. I haven't had a blister once and the leather is like butter. They are not to everyone's taste and they are an investment purchase but they are the best. They last years and are repairable.
2nd- Birkenstocks. Soft footbed. Better to go for the birko-f tops as they are easier to break in.
3rd- Crocs- I am not a fan of the Swiss cheese ones but the malindi,olivia and Alice ones are really neat on the feet and don't look too obviously 'crocs'. If you are working in a hospital they might be your best bet as they are hygienic etc.
4th - Dr Martens authentic wedge boots once you break them in!
5th- Fly London wedges. Not heeled ones! Very good for a few hours.
It is worth looking at Amazon Warehouse for bargains. They say 'used' but I have bought several items and they have been pristine. I have bought things a fifth of the price at times.
HTH.