Just for the hell of it, I thought I'd make a list of the Top 10 Holy Grails of classic microcomputer computer collecting. This is the "Rembrandt in the Attic" sort of stuff. These are roughly in my opinionated order, but somewhat randomly ordered:

1. The Altair prototype that was to be the cover photo for Popular Electronics but was lost in shipment 2. Xerox Alto 3. Mark 8 4. Scelbi 8H 5. Kenbak-1 6. Micral 8008 7. Apple I 8. An unassembled Altair 8800 Kit 9. Busicom Japan Intel 4004-based Calculator 10. IBM 5100