Check out endless, bb. They have a huge variety of brands, everything from super cheapies to $500 shoes. All free shipping all the time, and free return shipping as well. I can tell you from experience that the returns really are hassle free. You can filter by size and price, this way you don't have to wade through a bunch of shoes you can't/won't buy.

I also like DNA Footwear, Berk's Shoes, and Infinity Shoes, because they carry brands I have difficulty finding elsewhere.

Some of my favorite brands are Seychelles, Miz Mooz, and Chelsea Crew. I also like Biviel and Frye, but they're a lot more expensive.