Let's keep in mind also, that the 16-64K
motherboard is far more
valuable/rare/suckerbait than the 64-256K board.
I have looked through maybe a couple dozen 5150, and passed on another half
dozen last week (although its curious now my saavy friend grabbed them up
and asked for more), but I still only have about 3 or 4 at home and none
are 16-64k motherboards. None are in especially "nice" condition either,
good shape, but they show there age.
Just thinking about it, if I put together a NICE complete 5150 system,
monitor, keyboard, mouse, set of IBM sleeved manuals, loaded original
software etc., like hell I would put it on ebay. I am pretty sure I have
all the bits, except that my manual set is a bit newer.