My choices in order based on current prices
1. Solidigm P44 Pro. 2TB Amazon $150. Step up from P41. Faster than 850x. I personally have not used this and the enclosure will be the llimiting factor. Reason to get is that it future proofs your purchase.
2. If you dont want to pay that much, get hte Hynix P31 2TB, Amazon $120. I have thi in a Acasis case and runs really well and reliable and cool. It probably wont be any slower than the P44 Pro. Later, if you want, you can buy anohter one and raid0 the 2 together. That is what I am doing. 6500 MBps sequestial R/W speed.