me201 reacted to porina in what's a good upgrade for i3-8100
What do you hope to achieve from the upgrade? Only the CPU or more too?
If CPU, the logical and easy choice is to see what used Coffee Lake (8th and 9th gen) CPUs are available at what price.
No need to look for an overclocking mobo at all even with K CPU. If it ever reaches the stage of changing mobo, then a wider platform upgrade could be considered.