Maybe not as easy as PETs and Apples, where the inside didn't change a lot, but if you compare them to the cars of the 60s and 70s they have a lot in common - a wide variety of names and companies, but most are just believed to be common crap. And within a blik of an eye they are vanished and become desirable. Also, see the technical aspect, they are so fast changing that it's realy hard to get a full blown configuration of one era. <Partly Offtopic example> I just have this problem for a PC I configured about two years ago for my younger daughter - a BIOSTAR 8500TVD Board with an K5 PR133. I choose this board since I thought about upgrading it later on with an Pentium 200 (At this time the 200 was some 600 USD). Now, When I wanted to upgrade (she insists in using Win95/8) a P200 isn't available any longer - and even K6 are hard to find not to mention a K5 PR200. </offtopic> So maintinig such Systems will become a problem over the years. And more complicated than any S100 or Apple. BTW: why is an Apple // a classic ? There are still zillions out there. In fact they are less collectible than most PC types in term of rarety. And to come bach for your question: I think this ~10 year thunp rule is just as good as the 20 year rule for most car collectors. A owner of a 1974 VW K70 is considered by some 'real' collectors owning a 1936 Mercedes not a collector, but I would disagree. Gruss Hans -- Ich denke, also bin ich, also gut HRK