Although Acorn designed the ARM chip in 1983 as the Acorn RISC Machine, in 1990 it was changed to Advanced RISC Machine.
Acorn is a local company for me - a load of my colleagues / contacts through the local tech scene worked there.
It's also a company whose products I originally saw in school when I was about 8 years old - they were the fancy computers, the ones kids like me weren't allowed to mess with.
Anyway, they don’t sell machines. They sell designs.
and when you look at the prices of them (the setups for hotswapping) you'll go with that