I've sailed out of Marina del Rey but my wife hates the bathrooms (D basin north) so we wouldn't be likely customers unless we joined a slip-owing club there. Bare rough cold floors, steel "mirrors", harsh "prison" lighting, minimal privacy, cold.... But then there was another marina bathroom (in AZ!) we visited that spoiled her with high-thread-count towels, hair dryers, toiletries, and real hardwood partitions. Somewhere in between should do just fine.
The general impression of SoCal vs. the Bay area seems to be that the Bay is around 30% cheaper -- more so as you get further from the city and Sausalito. In San Diego, Chula Vista, Driscoll's, and Mission Bay seem less extortionate. Ventura might also be an option for us. Santa Barbara seems to combine primitive bathrooms (the ones we've seen) with the eternity wait list (unless maybe we buy a "teardown boat" in a slip?).