Some systems I've had are:
RM Nimbus PC-386's, 4 of them
These I got from a school. MCA bus 386SX pizza-box systems. Interesting little machines unfortunately proprietary-everything. Had a hard disk interface resembling the PS/2 model 55 but incompatible. Never really did much with them, and sold them for peanuts years ago. I still have some pic's of them if anyone's interested.
Various Amstrads, most memorable were the PC-1512 and 1640. Poorly built, but good-enough for what they were. Also the PCW-8256 and a PCW-9?? with those weird 3" FDD's. 1640 was my first color computer, had some good fun with that, but ended up sitting in the corner and
eventually sold. Would have kept it but it needed the monitor to operate, so took up too much space.
An apricot something?, black, had a monitor that had power supplied to it via the DB-9 port! A: was C: and C: was A: and i was always confused. Interesting system, but someone needed the keyboard from it, so it sat around unused. I think i scrapped it actually. Sorry, was 2002 though.
Were Viglen UK? Parents had one, first time I learned the term proprietary. Elonex, made some nice systems, were they UK?
Acorn/BBC, not PC's. Owned a few but always nonfunctional, or missing parts.
Seems to be a bit of a trend there. Interesting and sometimes inventive, but also odd, and difficult to repair/upgrade. None had a metal case and were often cheaply made. Probably why they all disappeared.