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how's this one look? Def a bit more than I wanted to spend so might hunt on ebay or wait for a deal...
edit: just seen they don't come with memory, storage or OS installed. That'll drive up price. I can repurpose an old SSD for storage at least...
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That would work great. You could get away with less but it's really the kind of thing where you want to set it up and leave it rather than having to think about upgrades, etc.
If you're reusing a drive be aware that some, such as the one you've linked, only take m2 drives and others take both m2 and 2.5". You can pick up a copy of Windows for £5-£10.
It's the first digit (or 2 digits in the case of tenth gen) after i3 or i5 or whatever.
E.g. i5-8250U is 8th gen.
i5-5250U is 5th gen.
That 8th gen is probably at least twice as fast as the 5th gen.
A modern i3 is often faster than an old i5.
https://www.cpubenchmark.net/ is a good site for comparing them. The old rule of thumb was that each stream to be transcoded would take about 2,000 of the CPU score. With the hardware decoding that may not exactly be the case now but it gives an idea.