What's your idea of a good salary?

[CC07 PEU]

Having just watched episode one of the 2014 series of The Apprentice, I noted a chap who said something along the lines of "I don't want to find myself at age 40 on £50k per year, driving a four year old Toyota". Many people would probably be glad to be earning £50k a year so it got me thinking:

Regardless of how much you currently earn and your position, what in your mind is a 'good' salary?