Back when I looked into it a lot (around 10th gen), idle power is an enormous rabbit hole. The motherboard makes a huge difference with Intel CPUs, like 12th-14th gen was regarded as worse than previous gens (especially 8th-9th), except when paired with a low-power board like most ITX or Kontron K3843-B, then the idle power can be very low on these.I've been looking for a similar setup. The CPU you've gone for is the same as I'd arrived at. I'd read it consumes less at idle than the newer Core Ultra CPUs.
Reviews tend to distort things, because they inevitably use high-end boards with loads of ICs (TPU use a Z890 Hero for the 250K review, for example).
Overall, I'd say that unless you're going to specifically optimise for low-power and choose all the components (including board, PSU, drives, etc), it isn't worth picking a CPU based on their idle or lightly threaded power consumption, because any advantages will be redundant. E.g. just enabling EXPO/XMP alone with a Ryzen CPU, can often increase power consumption by some 15-25 watts, which would wipe out most of the savings on a low power CPU or motherboard.
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I'm thinking DDR4 is the way to go, along with the case that is what I have decided on so far.