Have at least two screens. Have more lights. Have a good ergonomic gaming-like mouse.
Screens should be 2+, not 1(unless it's huge and ultra-wide, hence more expensive). Mouse should be with high DPI and 7+ buttons programmed as shortcuts (specially if you have two BIG screens). Lights should include a workstation-specific lighting with individual control. Screen brightness ought to be a function of indoor lightning's brightness, which should be high, and a function of outdoor brightness and time of day (independently). You are likely to have less lighting than optimal, most work environments do. My therapist said I must not talk about monitors heights anymore.
Don't know much about the what's the proper angle between screens, willing to hear an informed opinion. I recklessly use 20 degrees.
Spend money on ergonomics is not correctly phrased, most people haven't a clue about how ergonomics ought to be. Spend time(researching) on ergonomics it's a better slogan.
A few studies:
Veitch, J. A. (2012). Work environments. In S. D. Clayton (Ed.), The Oxford Handbook of Environmental and Conservation Psychology (pp. 248-275). New York: Oxford University Press.
Veitch, J. A. (2006). Lighting for high-quality workplaces. In D. J Clements-Croome (Ed.), Creating the productive workplace (2nd ed., pp. 206-222), London, UK: Taylor & Francis. http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=shwart&index=an&req=20377130&lang=en
Veitch, J. A., Stokkermans, M. G. M., & Newsham, Guy R. (2013). Lighting lighting appraisals to work behaviors. Environment and Behavior, 45(2), 198-214. Available at: http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=shwart&index=an&req=21268291&lang=en
Veitch, J. A., Newsham, G. R., Mancini, S., & Arsenault, C. D. (2010). Lighting and office renovation effects on employee and organizational well-being (NRC-IRC Research Report RR-306). Ottawa, ON: NRC Institute for Research in Construction. http://doi.org/10.4224/20374532.
Continuation of: Spend Money on Ergonomics, by Kevin
Three years have elapsed since Kevin wisely told us to spend money on treating our bodies well. It may be time to check for new gadgets, to verify what has worked and what has not etc...
If you have purchased an item for this purpose, or intend to buy one and don't know which, tell here, ask here.
Nick Bostrom uses a mouse that looks like a plane controller joystick.
I've seen keyboards that bend sideways, that are concave, that are convex, and that look like a sphere.
At FHI, dozens of books are used so that computer screens stay at eye level or above.
But I am no expert and I have not looked myself, nor would know how to. So please share in the comments the best knowledge about:
Keyboards
Mice
Chairs
Balls to sit on
Pillows
Beds/Matresses etc..
Screens - Size, position, brightness etc...
Other household office items - Stairs, Handles, Shower etc...