If you want to be able to still haul stuff in the bed, go with shackles. Lowering springs will probably reduce your loadability significantly. You'll get about 1.5" out of most shackles.
2003 Ram 1500 QC Hemi Lonestar "Big Red" (Mods list in profile)
2006 Charger R/T "Little Red"
Sarcasm - it beats killing people