128k Spectrum +2, with built in tape drive, although I have no idea how much it cost as it was a Christmas present.
I then got an Amiga, but not the 500 that everyone else had, as somehow I / my art teacher managed to persuade my parents that I needed a Amiga 1500 (I think) which had more RAM to support my "artistic endeavors" (??) on Deluxe Paint. I remember it cost £1k which was a very large amount of money in those days (3 times the price of the 500), and we had to go to a computer shop in Leeds (next to Armley prison) to buy it for some reason.
Anyhow it got used mainly to play games, with the occasional foray into digital painting.