I think he said in another post he has 7+ shops he hits on rotation. You two should hook up to coordinate efforts.
I'm an LA native an I've never seen anywhere near the amount of stuff dark matter has shown in any one single store. That being said here are some recent LA finds.
GW on Beverly, besides Cantor's: Tom Ford tie
GW in Santa Monica, two charvet, and two Turnbull Asser shirts
GW in Culver, Chan MTM suit
GW on LaBrea, two hand tailored Brooks Brothers suits, HF Suit.
There is good stuff here, but it is rarely in one place unless someone just dropped off a big load of clothes at one GW.