But SOA replaces everything you mentioned plus a full high steer setup (not pitman arm with bent drag link) and a traction bar (called ladder bar also) in the rear to thwart axle wrap.
I did my suspension for under $1000. Front fenders aside (same effect by cutting or adding bumpstops) it wasn't that bad on the wallet. And yes that includes the SYE. Driveshaft. Springs. Shocks. Ubolts. Pitman arm. Teraflex rear shock relocator. Boomerang shackles and revolvers up front. (Just barely, actually!!) I did the rest (fenders, teralow, super 88) all for under $2500 TOTAL!!!
Luck Favours The Prepared