But there are alternatives. There's Intel's motherboard-mounted 815 chipset adapter, for example, as used in one of our group test machines. This perhaps makes more sense in a business PC, allowing the budget to be spent on more important components, such as the monitor. Here, we'd say that a 17in display is an essential. Anything smaller will probably be bad for the eyes, while a 19in display is only practical if the user has a large desk.
Quality beats quantity here.
If you're spending seven hours or more each day in front of a monitor, it's got to produce a sharp and stable image.