BTW: the thing that has me floored is that the offer would be jaw-droppingly good anywhere else, but has me wondering if it's worth it in the Bay Area. Your real estate costs are mind-numbingly insane. In the long term something has to be done about this or employers are going to start fleeing the area in search of reasonable wage environments, because employees in the valley have to ask for at least 50% higher wages simply to break even with other places.
What are your thoughts on east bay: Newark and Fremont and such?