Can I improve this $2,000 PC build before buying the case and monitor?

Since you have room in the budget before buying the case and monitor, consider moving up from the 7600X to a Ryzen 7 9700X. A 7800X3D could also be worth considering if you find a good sale or bundle with memory, particularly if this is primarily for gaming. Either way, prioritize a reliable 750W power supply rather than cutting costs there.

The biggest issue is the memory kit. Around $540 of the build is going toward 32GB of DDR5, which is wildly high compared with the cost of the Ryzen 5 7600X and motherboard. A 32GB DDR5-6000 CL30 kit should cost much less and would free up enough money for the case and monitor without needing to change the rest of the build. The motherboard warning about a missing second EPS connector should not matter for a 65W processor.

You can save about $75 by switching to a Silicon Power Value Gaming 32GB DDR5-6000 CL30 kit. That’s a much more reasonable price and the specs are a good match for this platform. I’d put some of the savings toward a higher-quality Montech Century II power supply instead of keeping a questionable budget unit.

The parts list is generally solid, but I’d be cautious with the power supply if it’s one of the lower-rated revisions. A good-quality 750W or 850W unit would be a safer choice, especially if you might upgrade the graphics card later. For cooling, a Thermalright Peerless Assassin or Phantom Spirit would cost a little more but offer better performance and can potentially be reused in a future build.