In Search Of Ceremony Location

Can`t help you with Orange County, but I may know of some places in the South Bay (By South Bay, do you mean the Silicon Valley/San Jose area?)
There`s the Hayes Mansion (website): http://www.hayesconferencecenter.com/
Also, the Decatholon Club in San Jose is a popular place for weddings. I heard Freedom Hall is a nice cheap place for a wedding as well. If you`re into koi ponds and pretty landscapes, check out the Japanese Friendship Garden located in Kiely Park, San Jose. It`s a great place for pictures and the park will allow you to rent a temple-looking structure in the garden to hold your reception.