It sounds like your wallet is open!
First, in the era of multi-cores, multiple discrete processors are not needed for a gaming rig. Many of the games wouldn’t make good use of them, and those are mostly used for Enterprise VM farms or possibly hand-coded calculations (stock trading, bitcoin).
So, I will assume you do NOT want to go with the M-series from Apple. (Performance is great but game selection is comparatively limited).
Asus is the leader in gaming motherboards. Supermicros are aimed more at business, but are well built, and worthy of consideration, especially if you just want performance and don’t need extra flashing lights!
I personally go with Intel for the chipsets, but gamers tend to go with a top of the line AMD Ryzen processor. nVidia presently makes the highest performing graphics cards, and for your application, that is as important as the processor. Get high speed on-board m.2 SSD (not PCI-E or USB based).
For Internet playing, get a service with highest throughput, but also lowest latency (no satellite, OTA). Cable connection is probably the fastest consumer option.
Make sure your case/motherboard has plenty of cooling! Don’t skimp on the power supply, many are overspec’ed compared to actual performance.
Finally, if you use the keyboard for your gaming, get one with real switches instead of membrane. I prefer a “clicky” keyboard, but a gamer might prefer short-throw keys.
Tom’s Hardware is a good reference guide for gamers.