Well,
RE 4.5" superflex w/full leaves of course: $950
RE 5.5" not the long arm, but with all the goodies: DBs, HD tracbar $1400
Difference: $450
Price of mods to be added to RE 4.5": DBs, HD tracbar, etc. over $450.
*Scale these prices down a little, because from Redrock4x4 or Jeepin.com...