Liger has the commercial edition, according to his/her profile. The limit, in this case, is your monitor. 13-inch monitors usually support this as a maximum resolution. With a 20-inch monitor, you can run and test at 1920x1440. Only CRT monitors go that high (the closest LCD's get is either 1600x1200 or 1920x1080). An LCD monitor supporting 1600x1200 costs about USD$450, but a CRT supporting 1920x1440 costs only USD$220 (but with a $40 shipping fee, still making it about half the price).