Avoid headaches: The correct height for your monitor

How do you set up a computer workstation? Do you buy monitor risers or remove the CPU from beneath the monitor. Will even lower monitor positions cause neck strain?

Can you get away with tipping the monitor down to avoid glare or should you invest in indirect lighting? How about viewing distance? 16 inches? 25 inches? Or even farther? Does screen colour make a difference? Is there any evidence that ergonomic workstations improve work performance?