Keyboards, mice, hubs, stands and desk peripherals from HP, Krome and NB.
For a desk you sit at daily, the two things that change how it feels are a monitor arm and a keyboard that suits your hands. Both are cheap relative to the machine and both are usually left until last.
Mechanical keyboards last longer and feel better to type on, but check the switch type: linear switches are quiet enough for shared spaces, clicky ones are not. If you share an office, that is not a detail.
For hubs and docks, confirm the power passthrough wattage. A hub that does not pass enough power will keep your laptop from charging while everything is plugged in.