I have long, narrow, flat, arthritic feet and I like to walk.
These miserable feet are happy in Keen shoes, which I order from zappos.com (free shipping in both directions), and some Earth shoes, which come in a surprising range of colors and style. Both brands come only in medium widths, but with socks, especially handknit socks, they are fine. I've got some New Balance walkers in narrow width. They are nice and snug in the back and forefoot, but the toes pinch and for some reason they feel very hot.
BaaBaa on Ravelry