I haven't worked Big Law myself, but most people on this board who have, seem to say that most Big Law associates will work 60 hours. Those 80 hour weeks are only if a major project is due, or a complete urban legand.
There are also plenty of MidLaw firms out there with a starting salary in the $75K-$95K range. They generally have billable requirements to Big Law (from what I've seen), but are located in a lower COL location, so it's not a major drop in salary.
Governtment jobs can range from $45k-$145K depending on what your job is and what level of government that you're working at.