HP ZBook Fury 15 G8

On the other hand it has less ports than Lenovo ThinkPad P15 G2 (it has 2xTB4, 2xUSB-C and 2xUSB-A) and worse internal port selection than HP ZBook Fury 15 G8 (it has 2xM.2 + 2xSATA or 4xM.2 ports for SSDs). Sadly, I didn't had an opportunity to test the later two, so can't say about their performance.

If you care about the upgradeability, then HP ZBook Fury 15 G8 will get you covered. Device supports up to four RAM modules and four M.2 SSDs or two M.2 SSDs + single 2.5" SATA disk. Battery, WLAN and WWAN (LTE) modules are also easy upgradeable. GPU is also not soldered, so upgrade is possible in theory.

They offer superior build quality compared to a gaming laptop and the option of next-business-day on-site repairs for up to 5 years. There are plenty of options available in your price range like the Dell Latitude or Precision, Lenovo ThinkPad P-series, or HP Zbook. If you use live chat, you could probably get a salesperson to give you a bigger discount than what might be available by simply ordering from their website.