Commodore Vic 20
The Commodore vic 20 was released in the early nineteen-eigthties and was a machine which sold in great numbers. The biggest issue was the limited amount of RAM. The machine had 5k of memory of which just over 3k was available for programs. Aside from this limitation (Ram expansions were available) the machine was very well made and ran many games at a surprising pace.
Mine, pictured above came from a Car Boot sale in the early noughties. I had forgotten about the computer entirely and had found it in a box a couple of months ago. Since getting it out of the box room and set up I have enjoyed playing with it and have spent a fair bit on stuff for it, including manuals, a memory expansion and an SD card reader which allows loading of software a lot quicker and easier than from tape cassettes.