I don't think that locking the front will really give you that much bang for your buck unless you plan to tackle lots of rough terrain. Not comparable to the difference between a locker rear and open.
I would definitely recommend either a LSD front carrier or a selectable locker. Auto lockers can bind, and until you learn the techniques to unbind them, you risk damaging your drivetrain. Bottom line, there is not a whole lot of places that a front and rear locked truck can get you that a rear locked or a rear locked / lsd front will not. The ability to turn it off will preserve your turning characteristics. I have had customers on trips who had auto lockers up front and had trouble making the tight turns in the woods.
Lock the front? Might as well, since you are in there for the gears. Just don't expect the same kind of improvement that you get when you lock the rear.