<jealous> Sometimes I'll run this eBay search & browse, and kick myself for throwing out so much "junk" in the '80s, or not thinking ahead & doing a little scrounging back then, ya know?WOW, I bet between us we have quite a collection. My oldest "computer" (trainer) is a Minivac 6010. I also have a PDP-8 with an ASR-33 Teletype.
My more "modern" ones are on the par with my Imsai 8080.
We have visited the American Computer Museum in Bozeman, MT. IIRC, it was started by a Russian immigrant who let his computer collection run wild. Then there's this gentleman in Portland, OR, who's working towards building a museum of working minis & mainframes.
Hey, speaking of "writing a book" on old computers, there is only one book I know of on that subject, "Collectors Guide to Personal Computers and Pocket Calculators", by Thomas Haddock, and it's out of print. The Pocket Calculators book, by Ball & Flamm, is still in print, however. That's the nice thing about books on obscure collecting niches - there's little chance of competition! LOL!
The only reason I have any of this stuff, is I scrounged before it became popular. I picked up an Imsai 8080 with disk drives and a DECwriter II terminal for 5 dollars at a flea market. (welcome to silicon valley LOL!)