When buying a new computer, It's important to look for a brand new motherboard that supports the latest generation processors.

As for storage, I will recommend an SSD preferably an NVME which are much faster than regular SSD's.

For memory, as of 2023, while DDR5 is available I will still recommend DDR4 because the difference in speed is still very small.
DDR5 is also much more expensive than DDR4.
However, with your budget of $2000, I would probably go for DDR5 right now so you are set for many years to come.
You can always upgrade your memory with better ones in the future.
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