So here some suggestions for setting up a good computer to build /e/OS or other Android Open Source versions. I made a budget, standard and high end proposal. I did not take into account too expensive solutions like AMD Threadripper and servers. Operating system is free as it is Linux.
Since I do have more experience with AMD CPU, the suggestions are with those processors but Intel is certainly also a good choice. The advantage with the AMD CPUs is the they have a graphic unit inbuilt, so one do not need a graphics card. The prices are from Germany and may vary wherever you are located. I took my favourite shop so prices may be even lower when buying from different shops taking the lowest price.
1x AMD Ryzen™ 5 4600G, Prozessor
1x ASRock B450M Pro4 R2.0, Mainboard
1x Patriot DIMM 32 GB DDR4-3200 , Arbeitsspeicher
1x Festplatte (SSD): SAMSUNG 980 PRO 500 GB, SSD
1x Aerocool Prime v1, Tower-Gehäuse
1x Sharkoon SHP Bronze 500W, PC-Netzteil
Total price around 411 €
1x AMD Ryzen™ 7 5700G, Prozessor
1x ASRock B550M-HDV, Mainboard
1x G.Skill DIMM 32 GB DDR4-3000 (2x 16 GB) Dual-Kit, Arbeitsspeicher
1x Festplatte (SSD): SAMSUNG 980 PRO 1 TB, SSD
1x Aerocool Rift, Tower-Gehäuse
1x be quiet! System Power 9 CM 400W, PC-Netzteil
Total price around 505 €
1x AMD Ryzen™ 9 7950X, Prozessor
1x ASUS PRIME X670-P WIFI, Mainboard
1x be quiet! Dark Rock Pro 4, CPU-Kühler
1x Kingston FURY DIMM 64 GB DDR5-6000 (2x 32 GB) Dual-Kit, Arbeitsspeicher
1x Festplatte (SSD): Lexar NM790 4 TB, SSD
1x be quiet! PURE BASE 500DX Window, Tower-Gehäuse
1x be quiet! Pure Power 12M 750W, PC-Netzteil
Total price around around 1600 €
Summing up, do not take less than 32 GB and only a M.2 SSD with 500 GB minimum. Prices are currently very low for RAM and SSD.
I would prefer even 64 GB of RAM and a fast M.2 SSD for building with at least 1 TB, its worth the price!