Never had the ZX81. Went for an Oric 1 16K at that time. Big mistake. Due to a parallel import and modified Oric mainboard (with associated problems) I returned it for a ZX Spectrum 48K. By then I had a mark III motherboard. I've had a few of these and some great peripherals like DKTronics keyboard, wafadrive (don't ask), Seikosha printer. Crazy days with those games like JSW, Tir Na Nog/Dun Darach and Marssport.
Later on I turned to the dark side and gotten a C64 (in anticipation o/t Amiga).
But then the fun was almost gone. The Amiga 500 (the first affordable model) took way too long so I briefly flirted with an 8-bit Atari 130XE. The Amiga 2000 that later I had was a problem ridden machine and ruined my appetite for computing a bit. Then with the purchase of the Atari PC4 (an 80286) things started to become way too serious. The Acorn A5000 was the first machine after my Amiga/PC fiasco (I had a few 500, 600 and 2000/2500) that made me smile again.
Then I regretted not having saved up for the more enjoyable and less troublesome Acorn machines. I briefly got even a Acorn Atom. But those BBC Model B's... they were indestructable... kinda like Daleks.. they just kept going.