Best pc for the sims 4 with the highest settings A LOT OF MODS & expansion packs

@kasimmer  Under $900 can certainly be done.  The lowest I'd go in a desktop is actually $640, with the minimum graphics card needed to always run TS4 on ultra settings:

https://www.amazon.com/SkyTech-Archangel-Gaming-Computer-Desktop/dp/B07JYF2394

That doesn't account for having lots of custom content though.  You could get a better graphics card and otherwise the same hardware for $750:

https://www.amazon.com/SkyTech-Blaze-Gaming-Computer-Desktop/dp/B07RHBLV7F

An even better graphics card, one that's kind of overkill for TS4 (even with lots of cc), is the Nvidia 2060.  This model is the cheapest decent computer I could find with a 2060.  It has a slightly weaker processor than the above models, but nothing that would make a difference to TS4.

https://www.amazon.com/SkyTech-Azure-Computer-Desktop-GeForce/dp/B07NV1PY1L

These models are all from SkyTech, which sells computers with good quality flashy parts (processor, graphics card, hard drive) paired with mediocre internal components (motherboard, power supply, cooler).  To get higher quality overall, you'd need to pay a bit more.  For example, a prebuilt CyberpowerPC desktop with the same processor and graphics card as the first SkyTech I listed is $700 instead of $640:

https://www.bestbuy.com/site/cyberpowerpc-gaming-desktop-amd-ryzen-5-2600-8gb-memory-amd-radeon-rx-580-4gb-2tb-hdd-240gb-ssd-black/6329757.p?skuId=6329757

A custom build from Cyberpower with all high-quality parts, and the same processor and a slightly better version of the same graphics card, would be $741, but unlike the others, you'd get 16 GB RAM instead of 8.  Also, you wouldn't get free shipping, so that's something to consider.  This is just so you can think about what you want in a desktop.  There are a lot more models to consider if you don't just want the cheapest option.  Let me know what you're looking for, and I'll find a few models that fit the bill.