I've not found any great places in the IE yet, but you mentioned LA too, so I'm assuming you're willing to drive a little. There are a number of good ones in the OC area like Cali Kid, Amazing Reefs and Aquariums, Ellis Aquatics, Coral Gazers, Reef Lounge, and Two Guys Corals (disclaimer: I've not been to TGC yet, but their reputation is solid for having excellent stuff). I know there are others I've not mentioned, but those can get you started if you're up for a drive.