Make a decision about 1 GBit/s or above 1 GBit/s first, the price difference is huge (switches in particular) - and the router itself is rather easy to replace/ upgrade later on, should the need arise.
Think twice if you want to spend on 2.5GBASE-T throughout the house now, and 10GBASE-T soon after.
If you buy new, 2.5GBASE-T Atom systems are reasonably priced at Jeff Bezo's used book store or Jack Ma's market places.
If you don't need above 1 GBit/s speeds now, there are plenty of options discussed at
(particularly in the second half of it, skip the rather dated APU2/3/4/5/6 options with their slow AMD Jaguar cores).