It's a good idea to trawl the commercial builders to see the bits of hardware they all choose to work together. They won't waste time on stuff that doesn't do the business because they can't afford to
I'm not a fan of overclocking.
Motherboards, I'm a Gigabyte buyer, but others may do the business just as well
Memory, just do Crucial. End of
Case and PSU. Just get a psu that does the business. But it's easy to replace later if it goes wrong