re: Help me pick home office equipment

I've worked from home for over 15 yrs:

Invest in a really good chair even if you have to pay for it out of your own pocket, something like a Herman Miller Aeron

Skip the 21" monitors and go to a pair of 28". Either mount them on articulating arms or put them on a riser with space underneath.

Personally I've never seen the need for a docking station, it takes < 5 seconds to unplug everything on my laptop and put it in a pack. If you're away from the home office enough to "need" a docking station, just get a second power supply, HDMI cable, and mouse and keep them in your go bag.

If you have the space to spare, pick a spare bedroom and transform it into a permanent office space. Replace the hollow core interior door with a solid core door and depending on how many shared walls you have with the rest of the house blow insulation into them for sound isolation; don't forget the ceiling if you're in the basement.