First of all, it's a bad idea to take out a 30 year mortgage. A 30 year mortgage is for someone who is buying too much house for their income. Imagine a 3rd person who buys a house for 3x their income, pays it off in 10-15 years, and then spends the remaining 15-20 years investing his housing money. (As it happens, I took out a 30 year mortgage, but refinanced it to a 10 year mortgage after 5 years).
Second, you probably shouldn't expect to get twice the salary moving to SV.