One of the important things in a computer ergonomics is about a computer desk. We all have heard about health problems caused by sedentary work. Neither regular breaks during work nor physical exercises can free you from discomfort from sitting on a chair completely.
My personal recommendation is to alternate sedentary work with work in standing position. You might have heard about work at standing position, which enables to transfer the load from one muscles of a body to other ones and to relax neck and back muscles. To make it possible you can either buy a special table with height adjustment or a special support for a usual table.