@Ishman: the intel 10900k is not priced at ~$900. It's MSRP is $539.99 and you can currently buy it for that price from Best Buy (https://www.bestbuy.com/site/intel-core-i9-10900k-10th-generation-10-core-20-thread-3-7-ghz-5-3-ghz-turbo-socket-lga1200-unlocked-desktop-processor/6411492.p?skuId=6411492) for example. The price you linked to is a 3rd party reseller selling the CPU at an insane markup. Once Newegg has the CPU back in stock the price will return to MSRP (fair to criticize Intel's lack of supply for the chip of course, but this is a standard thing to see in the tech space, AMD has plenty of experience with paper launches as well). There are also plenty of Intel CPU's that can multi-thread very effectively and not implode, which I discuss in more detail below.
@Cyan Leader: I'd definitely heed the advice seen I a few comments and wait a month if you can. There are some very big and anticipated releases coming from Nvidia's GPU division in September, and AMD's CPU and GPU division in September and October respectively. These releases will potentially have major implications in both the CPU and GPU spaces. For example, it is anticipated that AMD Ryzen 4 CPU's will finally put the last nail in Intel's coffin and close the single-threaded performance gap held by Intel CPU's and really put Intel on the backseat, forcing down prices. Furthermore, the GPU releases from AMD and NVIDIA are suspected to be the most competitive they've been in years (and have led to some wild behind the scenes jujitsu between them with their chip suppliers TMSC and Samsung).
However, the best thing about waiting for these releases is that it will push the previous gen hardware prices down, allowing you to pick up current gen (as of August 2020) components for reduced to significantly reduced prices just by waiting a month. The reseller market will also be filled with excellent deals as people look to sell their current hardware to upgrade to the newly released tech. So buy either the newest stuff or take advantage of the cut prices, either way you win by waiting right now, if you can afford to wait another month or two.
As for a discussion about which CPU is best for you, I'd highly recommend these two videos from Gamers Nexus and Hardware Unboxed (can't go wrong with either):
Spoiler
https://www.youtube.com/watch?v=VDZQCcDMcfw (https://www.youtube.com/watch?v=VDZQCcDMcfw) (article version (https://www.gamersnexus.net/guides/3589-best-cpus-of-2020-so-far-gaming-production-overclocking-budget))
https://www.youtube.com/watch?v=jvskkQJ5lpo (https://www.youtube.com/watch?v=jvskkQJ5lpo)
If I was building a system PURELY for Starsector performance right now, I'd be looking hard at the Intel 10600k. Excellent gaming chip with it's top-of-the-line single threaded performance and with 6-cores/12-threads you have plenty of headroom for other lightly multi-threaded tasks.
This may not be the best CPU for you however! It all depends on what you plan to do with your PC and what your budget is. If you are building a performance gaming PC, the 10600k is likely the one for you, but if you plan on doing any rendering or workstation-esque workloads then you should be looking at Ryzen (in general, there are 10900k exceptions, and this doesn't touch on used hardware). There is no one best PC or processor these days, it all depends on what you want to do with your computer. The videos linked above do a great job breaking this down.
Bottom line, consider waiting and seeing how the landscape shapes out, as we are right on the inflection point. But still check out the videos above as they give a great feel for the current landscape and an excellent benchmark to compare against when things change.