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Raspberry Pi is now manufacturing 70,000 Pi 5s per week, will surge to 90,000 in February
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
My top recommendation is going to be an old desktop PC. Something with an Intel processor that ends with t.
X86 just opens up so many more options over ARM.
However if you want something new, the Zima Blade seems like a good alternative at a similar price point. And even includes 2x SATA ports and a PCIe slot.
If you want to learn embedded systems, the RPi is vastly superior to an old PC because of the variety of hats and the community support around it.