I have a pair of shoes from Stonefly Shoes that are the most supportive and comfortable-all-day-long shoes I've ever owned. They are leather shoes, not athletic shoes. They are pricey, but they work. I bought them before going on a work trip where I would have to be on my feet walking all day for several days in a row.
http://www.shoeblog.com/blog/focus-on-the-brand-stonefly/
I also have a pair of Riker ankle boots with a slight heel when I need to teach an all day class. They look nice and I can stand for 6 hours+ in them.
http://www.walkingonacloud.com/Brands/55-Rieker-Shoes.asp...
I am a runner, but I don't think that running shoes, or athletic shoes are the best for all day standing. I think a leather shoe or boot would be more supportive and last longer for you.
Clarks and Merrells are good brands, also. I would go to a store that sells all these brands and try them all on. I did that, and luckily had a very patient sales person, until I found the one that worked the best for me.