I also drive an 02 Cummins and have had no problems with the injection pump or any thing else. I bought mine at 137k and now have 179k and have owned it for 2.5 years. If I were to experience some of these ip problems I would simpley have nyceguy01 p-pump it for me along with a set of twins and a dd clutch for my 6spd:greg: If I were buying a truck today I would keep it simple and look for a 12v or a p-pumped 24v and put it in a 87-91 crew cab chevy 4x4 6spd:greg:
My old man bought a 99 dodge new and has never modded it. also never replaced the lift pump or the ip. He pulls a trailer with it always. either hay or cattle with a ridiculous amount of weight, still going today with about 180k on it.
Only you can make the decision, I am not comfortable in the 3rd gens so I am stuck with mine until I find a good chevy to swap my drive train in, someday. Good luck and it is a great time to buy as far as price goes.
edit, my old man has put about 3-4 fifth gear nuts in his tranny though.