Brooks Berdan, LTD in Monrovia. Optimal Enchantment in Santa Monica, be aware that parking can be difficult here. These are probably the two best sources close to you as far as friendly, knowledgeable owners go.
LA Audio on Western in Korea Town has one of the largest selections of the most brands in LA but, you won't get the personal treatment that you get from the first two.
Upscale Audio is not very close to you but, has a very large selection and often there is no waiting for shipping. You pretty much need to know what you are looking for when dealing with Kevin, though. Because he does so much mail order he sometimes is short on time and can be difficult to work with.
Brooks is very personable, and knowledgeable. There is usually a large group of guys just hanging out and talking audio at the shop on Sat. There is no pressure to buy and all questions are welcomed. Plus, he delivers and sets your system up as part of the purchase.
Randy is also very personable and knowledgable, witha good ear for music. His loyality to equipment brands is very narrow but, it is based on his own listening skills and taste. You won't find the brand of the month there.