Strut spacers are the best bang for your buck lift, but springs will give you smoother ride. As for struts, in the front Bilsteins will give you everything you need but are expensive. The KGB struts are about half the cost and about the same ride. Not sure how well they hold up to high speed runs across the desert though, but if your mostly on-road you probably don't need to worry about that.
It sounds like you might have some suspension wear though, you might want to check the bushings. BRD HNTR's rig had a bad diving problem between lanes and it ended up one of his camber bolts were broken.