@malanaab That's more than enough money to run both games on ultra settings, with room to spare, whether you want a laptop or desktop. Here's what you'd want to look for:
Graphics card: An Nvidia RTX 3060 or 4050 is overkill but well within your budget, so I'd suggest one of these rather than the cheaper 1650 or 3050. An RTX 4060 is more overkill and not necessary, but sometimes options with a 4060 are only marginally more expensive, so keep it in mind as well. An AMD RX 6600 is overkill as well, with anything higher (6700, 7600, etc.) being more power than either game can use.
Processor: Any sort-of-current Intel i5 or AMD Ryzen 5 (11th-gen and 5000-series, respectively) is sufficient to keep up with the graphics cards listed above. I would avoid an i3 or Ryzen 3 for longevity reasons—they're fine now but may struggle with complex tasks in a few years. Most of the 12th-gen and newer Intel processors have an issue loading Sims 3, but that can be fixed with a one-time patch, so don't cross off a system that's otherwise perfect for this reason alone. AMD CPUs don't have this issue at present.
Memory: Get 16 GB for multitasking and longevity, unless you're comfortable upgrading yourself. (RAM is cheap and very easy to install even in a gaming laptop.)
Storage: Since you want to play both games, 512 GB or more would be highly useful if not technically required. You could get a full terabyte but won't need it unless you like to hoard giant piles of custom content AND backup saves. Storage is also easy to upgrade, especially in a desktop, and not particularly expensive these says.
Screen: If you're buying a laptop, or a monitor to go with a desktop, it's worth considering a higher resolution, e.g. 2560x1440, and perhaps a higher refresh rate, something above 100 Hz. While you don't need either in the traditional sense, the higher res will make everything look more clear and sharp, and the higher refresh rate will make Sims 3 and everyday use feel more smooth. Whether Sims 4 benefits from the higher refresh rate will depend on what GPU you get—a laptop 3060 is not going to run the game at a consistent 144 fps at 1440p but mostly could at 1080p, other than the game's own slowdowns. Sims 3 has slowdowns too, but these graphics cards are above the level where it makes much difference.
With a desktop, you could of course upgrade the monitor later, so this is not a critical decision.
For desktops, these are examples of cheap good options that fit all the criteria above:
https://www.bestbuy.com/site/ibuypower-tracemesh-gaming-desktop-intel-core-i5-13400f-16gb-memory-nvidia-geforce-rtx-3060-8gb-500gb-nvme-black/6536552.p?skuId=6536552
https://www.bestbuy.com/site/thermaltake-graphite-360-gaming-desktop-amd-ryzen-5-5600x-16gb-memory-nvidia-geforce-rtx-3060-1tb-nvme-m-2-black/6488518.p?skuId=6488518
And this is more overkill and still well within your budget:
https://www.bestbuy.com/site/skytech-gaming-blaze-4-mini-gaming-pc-intel-core-i5-14400f-16gb-memory-nvidia-rtx-4060-1tb-nvme-ssd-black/6577926.p?skuId=6577926
These are hardly the only decent systems in this range, just the first ones I found with good build quality and a reasonable price for the configurations. If you'd like me to find other options that have whatever details matter to you, just ask, for either laptops or desktops, or monitors for that matter. And if you find something yourself and would like a second opinion, feel free to link it.
