The only place I know of in San Diego for quality dance shoes is Carmen’s Dance Shoes:

6506 El Cajon Blvd
Suite "D"
San Diego, CA 92115
(800) 854-4318
http://www.carmensdanceshoes.com/

The service was good there and they have a wide selection of all types of shoes.

Although I just use my regular dress shoes for dancing (which work totally fine if they are all leather bottoms) I think I might make the investment and get some real dance shoes.