I've actually done this math recently....$100k annual household income would be enough for us to have everything we need and most of what we want (within reason). $120k - $140k/yr and I figure we could have everything we wanted.

that's living in the kind of house we'd ideally like to have, in the area we'd like to live, driving the kind of vehicles we'd like, putting the kids in private school, having the "toys" we'd like to have and putting a certain percentage away each month for retirement.