i've got quite a bit into mine. but its all been gradual and here and there. i've got a build thread on gmfullsize thats more up to date than the one here linked in my sig.
http://gmfullsize.com/forum/showthread.php?t=266193
but i still haven't gotten my front end right and its been about 3+ years since i did my suspension lift. its almost there though. but i'm going to be getting rid of the RCD kit in the near future for a cognito 7-9.
got the RCD kit used for 850 on craigslist, moog pitman arm, idler arm, idler assembly, inner/outer tie rods, upper control arms/ball joints, lower ball joints, reman steering gear, power steering pump, royal purple steering fluid, power steering fluid filter, special upper control arm alignment cams that can't get knocked out (drilled holes instead of one big slide), bilstein 5160 resi shocks, new sway bar links from RCD, and timken hubs. and that about completes my list of front end/steering parts LOL and i'm at 200k miles.
depending on how wide of a set up, the RCX 6" kit is pretty budget friendly but it only drops your front diff about 4" and the rest of the lift is gained by cranking the torsion bars. if your only looking to run some smaller 33's on x9 or x10" wheels, should be perfect. when you crank the front end more, thats when you get front end parts wearing out much more quickly.