Shameless plug for commercial site:
I love Zappos.
For a small-town gal, being able to get that selection of fabulous shoes delivered to my door, OVERNIGHT, is liberating.
Their customer service is fabulous. And they'll honor any price of any other website (as long as the cheaper site has your size and color).
The fact that Zappos now sends me handwritten thank-you notes may mean that I've gone a bit overboard. But it's been fun.