I'd think the Google/Facebook/Netflix/etc. numbers is the market salary - it is somewhat known in the Valley that Netflix pays its engineers around $375k, mostly cash, for example.

What goes unsaid though is that there's a lot of silly hoops that have to be jumped through to get that salary at many of these companies (bad interview processes, companies realizing that actually wanted X skills for a position instead of Y, etc.).

It would all depend on your skills though. I once turned down a $350k-400k opportunity myself in the area and ended up taking a significantly less amount in favor of more vacation, flexible hours, and much less stress.