I have the 2001 Silverado 2500 HD, which has a very similar suspension setup to yours. A few months ago I finished a complete front end refresh, including bushings, ball joints, tie rods, idler arm/ bracket, steering damper, anti sway links & bushings, shocks, rotors, calipers, pads and brake hoses. And the items you have in question, the bump stops (bumpers). pretty much everything but the pitman arm. Except for the shocks & steering stabilizer (Monroe), and the brakes (Raybestos), all the rest of the components were Moog. I would say the ride is quite a bit stiffer and more controlled than before, the floating sensation, pitching, rolling, and bobbing up and down is now entirely gone.
I was in the same boat as you, let the old truck go for 3 - 4K and commit to 55 - 60k for a new one, or put some money and effort into updating it into the serviceable heavy duty truck it can be be. Before the whole economy fell apart I picked the latter, and have replaced all the accessories, the tires with new Michelins (some people will question judgement here), the whole AC system minus the evaporator, the rear brakes, oil seals, and diff gasket. Other than tire installation I did all the work myself. So far I feel like it's worth it, because the chassis, engine, driveline, and cab have held up well for 19 years of ageing. I may still replace the steering box and pitman arm to get more steering accuracy, and maybe the master cylinder too.
The point I'd make about your question is, don't think replacing 1 component is a magic bullet that's going to make it run like new again. All the stuff under there works in a system, like a team of parts. Make a plan to renew all of it and do your best to stick with that plan. And yes, Moog is one of the better brands, even though it's made in China.
