Buying help: E595 vs P51 vs X1 Extreme Gen 2 - CAD

Hi all,

I'm looking at purchasing a "new to me" laptop to replace an older desktop that I currently use. The desktop is pretty low spec, so all of these laptops will be better than it. I am doing a lot of work from home and do CAD work as part of my job, so I'd like the laptop to be able to handle that pretty easily. I don't typically do any gaming but do some photo work in Photoshop style programs and a SD card reader would be nice, but isn't a deal breaker. I am planning to upgrade the RAM to 32 GB and maybe the harddrive on any of these machines, but I'm not as knowledgeable about the differences in the Thinkpad models and CPUs.

Any comments on the costs and whether the models would work well for my uses are much appreciated! I can also try to get more info on any of these if that would make the recommendations easier. I am also open to suggestions of other models that might be better for my work.

EDIT: a word

EDIT2: after reading more on the wiki (some of which is out of date), it seems the Option 2 (P series) is probably my best option. However, is this a decent configuration and good price?

~~Option 1: Local Classifieds - $575~~

* ~~2020 ThinkPad E595 15.6in~~ * ~~Quad-Core AMD Ryzen 5-3500U~~ * ~~AMD Radeon Vega graphics (unspecified)~~ * ~~16GB RAM~~ * ~~512GB SSD~~ * ~~Windows 10 (not specified which version)~~ * ~~Includes extra SSD (unspecified)~~ * ~~Used less than 6 months by owner~~

Option 2: Ebay - $700 currently

* P51 Mobile Workstation 15.6in * Intel Core i7 7820HQ 2.9GHz * NVIDIA Quadro M2200 * 4K screen with PANTONE color calibration * 16 GB RAM * 512 GB SSD * Windows 10 Pro * Small crack in the bottom right of the case

~~Option 3: Ebay - $535 currently~~

* ~~2018 ThinkPad X1 Extreme 15.6in~~ * ~~Intel Core i7 8th Gen., 4.10 GHz~~ * ~~16 GB RAM~~ * ~~512 GB (+ 1 TB ? unclear in posting)~~ * ~~Windows 10 (unspecified)~~ * ~~Dedicated Graphics~~ * ~~Minor wear and tear from use~~