Eric is fragfarmer (I forget his partners name), I was going to get mine from him until I found the deal Scott Berman had. He actually can get a few different quotes from different manufactures just to compare for you.
I don't know of any custom builds in the LBC, but Circle pets and Strictly fish have some great deals on regular tanks. Spend the time making phone calls, then drive to the shops to see some of the manufacturers products.
SoCal Creations is another one for Acrylic tanks you should look at.