Three of my old computers which I now wish I'd kept:
The Thinkpad 701C with the "butterfly keyboard" (I continue to be surprised that no one has resurrected that. It was a rock-solid keyboard):
Commodore SX-64. The "portable" [sic!] version of the C64
Tandy 102. Was very useful for downloading DUATS wx and forecasts in its day; I even figured out how to null-cable it to my PC to move old Commodore 64 documents in ascii format.