i have the 4.5" RE coils. have had them for almost 4 years now. great product.
youll want an adjustable track bar, extended break lines, longer sway bar links, lower control arms, and shocks. id also add uppers to the list, but they arent mandetory.
like the uppers, control arm drop brackets arent needed, but are very nice. there are cheaper alternatives like redrilling your axle side track bar mount to use the stock track bar, using some sort of spacer to reuse your shocks (there are also OTC direct replacements, youll have to look around or get chummy with the parts guy), or relocating your stock break lines. there are a lot of write ups. but youll never be dissapointed with quality parts.
id also suggest adjustable uppers versus fixed. this will let you use the stock castor adjuster to adjust wheel base (only talking a small amount) and use your adjustable uppers to help keep castor in spec. adjustable lowers really arent needed.