If you are planning for future mining expansions, you must choose a decent high watts rating PSU and motherboard with more PCIE slots, z270 series or PROBTC boards will do, and also you don't need basically such powerful CPU as you are aiming for GPU mining rigs.
for 1k$ at least you could have 2 GPU's rig on it. exclude the case, you can do open air mining rigs instead.
Thank you for the reply! I think I will not expand in the future, since the main goal is just contribution to the ledger. I choose cased miner to have my apartment a bit neat (my wife is not into open air rigs
)) Indeed the CPU is overkill but that's the lowest option in a customization of the shop I am using. Do you have any advice on components store with delivery to Europe?