Another spot is Audio Concept in Long Beach (Belmont Shore area). They carry Snell, McIntosh, Paradigm, Marantz, Definitive, NHT, Lexicon, and some others. They have quite a few things in their showroom. They're pretty much a custom shop but I've auditioned things there in the past and they're quite knowledgeable.
Also, Ken Crane carries Rotel & B&W. Depending on the store, they usually have the full B&W line in store hooked up to Rotel to audition.
And one last place is OC, is Genesis Audio & Video in Irvine.