I see someone else suggested The Pump Station to you in Santa Monica. They also have a location in Hollywood. They are GREAT. The nice thing about them is that they will totally FIT you to size so you find a great bra with a excellent fit. Also, they have a lot of options for the larger sized bra. I was a DD pre-pregancy, and after my milk came in I was a size I had never heard of before. The Pump Station saved my life! Well worth the drive, and the money.
There is another store I found since then that have nice nursing bras as well, and they have just as good service. In fact, I find their prices to be a tad bit cheaper than The Pump Station. HOwever, they are located in Montrose (near Glendale). So, I'm not sure if this is an option for you. But, it is called Bellies, Bosoms and Bottoms. It is a great maternity/newborn store.
Good luck, and CONGRATULATIONS!