> Kirby D-50

Agreed, but the newer models are solid, too. I bought a used Gsix in 2004 and, in 18 years, it has only needed belts and bags.

Kirby vacs are heavy & ugly, but are built like tanks and are easily repairable.

The best part about buying a used Kirby is not having to let a Kirby salesperson into your house.

The best office chair is one that actually fits you. Most are made way too big and plush, which leads to poor posture. You should be able to sit with your back supported by the backrest, feet on the floor, and still be able to slide 4 fingers in between the back of your knee and the seat cushion.
Standing desks are wonderful, but I still find the need to have a good chair because I can't stand all day.