I can't nail one I love most, but-
My front rigidco is priceless to me (I got the plate welded in custom)
Long arms are great too, along with 4.56's. All the expensive stuff.
OH! And frame stiffeners.
2001 XJ, patriot blue, 4 inch RE lift, IRO long arms, 33's. Caged, locked, armored -Trail Rig
2004 WJ Special Edition, Silver, 3 inch IRO lift, 4.7, JK graphite moab wheels/SRA's- Mom's dd
2004 WJ Overland, Onyx Green, 90% dechromed, soon to have JK moab's, BFG MT's, and a 3 inch IRO lift My new DD/ project