ZX81...
... I still have an unbuilt kit up in the attic, next to a BBC Master 128 and Sinclair QL, plus a couple of Psion 5's (UK original and US 5mx). The only home computer I sold on was my Spectrum, to fund the QL. Rooting about up there a few weeks ago turned up a pristine box of 5.25" disks, still shrink-wrapped (BT-branded, 90's piper logo). Aquisitional as ever - I can feel the need for a proper shed, with tool boards on the walls, power, heat, and somewhere for the home brew looming large some time soon...