If you are working for a large enough company, see if your benefits include an ergonomic assessment. My wife took advantage of this and it was great. Insurance company will send a rep to your house and measure things up, and order products for you that are required. It was a bit like Christmas the week or two after the assessment was completed and things started arriving: Keyboard tray, keyboard, monitor risers, foot rest, number pad, chair, monitor. It was crazy.
As was noted above lighting is a good thought and making the room comfortable where you want to work in it. For her home office we painted and put up some decorative wallpaper she liked. We also organized some things like shelves and storage spots.
My office was less involved but being in the basement lighting was a consideration. The one really good thing I got was a usb/Bluetooth speakerphone. It helped make a day of meetings more comfortable as I always find after a couple of meetings my ears/head are hot from over the ear cans or tired of ear buds. I did get a set of bone conduction earphones but that was after I stopped working. I could see them being really good though. The speakerphone was my fav though.
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