Lifters generally don't see a lot of wear...and I bought some generic ones off ebay that I had problems with (weren't pumping up all the way), so really I think that unless there is something majorly wrong with the ones you already have, just re-use them. I ended up putting a set of 140K+ mile stockers back into my engine when the "new" ones weren't working out, and they're fine.
As for other parts...generally you can just go with a parts-store rebuild kit, as they come with Fel-Pro gaskets and Sealed Power bearings & rings. Also, don't bother with any sort of high pressure or high volume oil pump...just run a regular one.