On the Hunt for Walking Sandals

Why can't comfort and style go hand in hand? I see it advertised everywhere, but I'm not a believer. I'm looking for a flat sandal that I can walk in for 8 hours when I go to vacation in Europe this year.

My criteria is no thong. Stylish. Slimming. Can be worn with shorts or dresses. Brown. Genuine leather. And under $50. Preferrably under $30. The first three are my favorites, but they are over my budget, and don't look like they would be very comfortable.

I have this last pair ordered and on their way. They are Patagonia's, which are known for their comfort and durability. My only concern is that there is no ankle strap. Will that flapping on the back get to me after hours of walking?