Big 4 versus Regional – Salary/Hours

I'm a new user to goingconcern: a junior in college.  I've been offered several internships (hopefully will lead to jobs).  Every firm I have looked at (EY, PwC, KPMG, Moss Adams, Andersen Tax, Frank Rimerman, Green Hanson Janks) has told me they've got great work/life balance, flexibility, benefits and people.   Does anyone have realistic data about the associate salaries, hours typically worked, and paid time off?  Would I be making a mistake by choosing a Mid-tier firm rather than a Big 4 firm to start my career?