McG's in Chatsworth, and The Daily Pint in Santa Monica.
The Daily Pint has about THREE HUNDRED varieties of Scotch, not including other Whiskies or spirits. It's a tiny place, there is limited parking, and they don't serve food (But they have the number of a local pizza place on the wall along with the bar's address!).
McG's doesn't have quite as much Scotch, but they have decent food and live entertainment at times.