Whatever OS you use, what is the resolution & colour depth of your desktop?
(If you use more than one PC, select the stats of your main/preferred rig.)
I have seen people try to use a 1280x1024 desktop on a 15" monitor, and 800x600 on a 21" monitor.
Are you one of the people that has to get the most on the screen they can, or prefer to have nice, big, readable (if somewhat blocky) text?