I guess it depends on a trading style and maybe importance of it in our lives. I prefer to have space to move around (don't like sitting on the chair all the time), lie down (nice sofa near by with the view on the screens), eat something (fridge, table etc.). Also I prefer natural daylight if available. Don't have a big screen as yet - was thinking to get a big touch screen. Somehow I can see myself concentrate better if standing in front of a big screen (as opposed to sitting or lying at least during important moments)
PS It may look a bit demanding, but one needs to be comfortable while trading.