If you plan to mount a winch, install heavier bumpers, or do a lot of towing and hauling, you may want to consider installing Add-A-Leafs on your vehicle. They will increase your payload capacity by 250 lbs to 500 lbs and give you additional height.
If your stock springs are sagging you may want to use an Add-A-Leaf to bring your truck back up until you can afford replacement springs. These can be easily installed with a good set of basic hand tools without removing the stock springs. (Note: All Add-A-Leaf's are sold as kits and include 2 leafs and longer Center Pin Bolts.)