Ok.
San Luis Obispo, has a great shop called the Sanctuary, solid selection great owners, all around a good time.
In the Westwood/Century City area there is a great store in Wally's where they have everything but Padron, and from what I read about you, you are a padron whore, you might want to skip it <3
Down in my neck of the woods there are about 4 stores worth checking out. The first is in Huntington Beach called Hiland's it has a solid walk in humidor and some nice leather seats. Great group of guys smoke there regularly. They have your much beloved Padrons, AF, Party, CAO, etc... Great service, and the help might not be very knowledgable about the cigars, but very nice and she usually throws in a couple of free sticks.
The Tinderbox in Crystal Court (Santa Ana) is solid, MSRP on everything, and they cary everything from FFOX to Davidoff to almost every Padron Anny, and even some 1926's. Great staff, can't smoke there, but you can definately pick up some smokes for the hotel.
Siglo Cigar Lounge down near the John Wayne Airport, probably the best humidor I have seen, besides the one down in San Diego. I would definatley check this out if you are staying around that area.
The Red Cloud is over in downtown Fullerton, it has an ok selection, the humidor seemed a little hot when I went there last, but I had been drinking so take that into account. The prices are about 3-4% above MSRP and as I remember it, there is no smoking section in front, but they do have a club you can join in the back that has a smoking area.
Further down south ask FetterJohn for the local cigar shops.
Down in San Diego there are a couple of shops, mainly in the Gas Lamp district, I would stay away from Cesars, as the humidor was like 80-85 degrees and a bunch of there stick were already starting to crack. In addition the supply was piss poor. Another one on the same street as Cesars is called The Cuban Cigar Factory has an awesome humidor with basically everything you could as for in a shop.