Unfortunately, 150K in California or New York/New Jersey is barely middle class - better hope for dual incomes... 150K in Nevada, Texas or Florida works better with no state income tax.
I do know one SWA 3rd year FO who is pulling in 130-140K but he is working his butt off for it and he has no family/obligations. Wonder how soon he will be burned out. Certainly don't get the variety of flying that a G550 driver would get...