you can go with a Ford V or X code on the front and either a B or modified B in the back to save money. These are stock springs and work real well. You can also add a RAS system on the rear for an extra 1" if you need.
Rancho builds great 4" lifts, Fabtech builds good lifts to with a lot of height options... One company that does a whole lot for Fords and really good lifts is Icon Vehicle Dynamics... Check them out!!!