SuperPET
My family had numerous Commodore computers, but when I started a computer consulting business, I thought the SuperPET was a superbly fantastic computer - it had both the 6502 and z80 processors, had the full range of micro programming languages from Waterloo (Pascal, APL, Fortran, COBOL, BASIC, as well as Commodore Basic 4.0. A half ton of documentation too. What a machine - IEE-488 connectors to daisy-chain peripherals, solid, Industrial -type construction. Built to last.