1. $80,000.00
2. About 25%
3. I have lived in the UK and there is no comparison, California would be much cheaper given the same size house. Petrol is 1.50 per gallon, cable, phone and utilities about the same (and no TV tax).
4. That salary would assume full health benefits.
5. Climate doesen't get much better!
My 2 cents, good luck.
D L