I think the type of tyre, type of car, driving style and road conditions govern what your tyre pressure should be. A local tyre place will recommend what they think is right but a little "suck it and see" by yourself will probably be the best option. Try a few psi above or below what they recommend and see how your car feels.
I've got a full set of Goodyear F1 Eagle(GSD3) on our Multiwagon.
Car nearly always has a load of some sort in or on it so I run the tyre pressures a little higher than recommended, checked weekly. Through the winter I had 34psi in the front and 32psi in the rear, during the summer I have 36psi in the front and 34psi in the rear.
I always have all 4 wheels balanced even though they say only the front need doing and I have the tracking checked regularly, 3 or 4 times a year.