So, didnt do an update to this for quite some time (alas, AlltagsGrauen is offline, so .. no opportunity to do that anyway :D).
Without further ado, the current system infrastructure I’m using these days (or am going to use in the near future):

Current main system:

Thinkpad T520, i5 2520M, 16 GB RAM, 512 GB SSD (Samsung Pro); always sitting in the resp. docking station, connected with FHD+ Display (1980 x 1280), a Logitech G710 (Cherry MX Blue switches) and a Sharkoon Drakonia Black.

Main OS: MX Linux 18.3 (based on GNU/Debian 10 “Stretch”)
Virtual machines: Windows Vista Pro, Windows 7 Pro, Windows 2000 Professional (strictly for using Photoshop 8)

Note: Yep, right – gaming equipment. Turns out, regular input devices are not reliable / endurable enough. Most keyboards tend to fall apart after just a year or so – that might be related to the fact that I learned to type on the original IBM Model M, and thus, my key strokes hit home VERY hard. But so far, anything with Cherry MX Blue switches, including the original Cherry G80-3000 “clicky”, has turned out to be most satisfactory, ie. very endurable and reliable working 🙂

Future main system:

Freshly in: Thinkpad P50, i7-6820 HQ, 8 GB RAM, 256 GB NVMe SSD, currently waiting to be upgraded to 32 GB RAM and enhanced with a 1 TB NVMe SSD (FireCuda 510 Pro). Also needs to be set up as dual boot system; maybe even triple boot, but that depends on whether the UEFI BIOS is going to cooperate or not.

Current main OS: Windows 10 Pro

Planned main OS: Linux Mint Ubuntu 18.04 LTS
Planned secondary OS: Windows 10 Pro, Manjaro 18 (KDE Edition)

Mobile testing environments:

• Honor 9, Android 8, running several mobile browsers, including Chrome Beta, Chrome Canary, regular Chrome Stable and Firefox Mobile Beta
• iPhone 4, Safari (legacy device; not really in use anymore, not even for testing purposes)