I would also recommend one... or 2 depending on your lift.
they look cool and REALLY help with comfort and control.
if youre going to wait, then maybe save and do everything at once... rag joint, gear box, linkage arms, tie rods AND stabilizer(s)... then watch your eyes pop out of your head as your truck will drive like a brand new car instead of a 5,000lb wet sponge X) LOL!!