What lens set you buy is pretty much up to what type of photography you want to do. I prefer having a set of lenses that go from 17mm to 400mm. That requires me to have 5 lenses. Then you get into specific task lenses like Macro's, Micro's, fisheyes, and Supertelephotos. If you do mostly landscape and portrait photos, keep in the mid focal lengths like that 18-55mm. If you do mid distance shooting, like a bird 40' from you, the 55-200. Its all personal preference.
Like I mentioned, both these specific lenses listed at that auction are PHENOMINAL lenses for the price.
edit: The first few sets of pics I posted on the first couple of pages of this thread are with that same 18-55mm.