Totally true about the wanting a 4/6 a year later. so what ever you do keep all your stock parts you take off. I learned that the hard way. a few hours in the middle of summer at the pick n pull drilling and chiseling(cus you cant have anything that produces spark) the rivets to the shackles and hangers of a wrecked truck. not fun.
Im currently running a 4/6 with belltech street performance, I like them and my wife says it rides better than her mini van. as
lo look for polyurethane bushings for front anti sway barand control arms. speaking of control arms, I keep ripping the boots on my upper ball joints because the stock upper CA is now at a weird angle and puts a lot of stress on them so the boots rip. now I need DJM upper CA to fix that(food for thought)
also look for a rear anti sway bar off of a Tahoe or suburban. that made a huge difference on mine. best o luck, have fun