Quote:
Yeah, but then it looks terrible.

Something about running it natively on a CRT monitor makes it not look so bad.
There are several settings in your "DOSBox.conf" file that you can tweak that will probably make things look better on a non-CRT monitor
Under the "[sdl]" section:
fullscreen=true
fullresolution=(a fixed size, your desktop resolution would be a good choice, e.g. 1024x768)
Under the "[render]" section:
aspect=true
scaler=(normal2x, normal3x, advmame2x, advmame3x, advinterp2x, advinterp3x, hq2x, hq3x, 2xsai, super2xsai, supereagle, tv2x, tv3x, rgb2x, rgb3x, scan2x, scan3x)
Note that most of the above will require another "output" type other than the default of "surface". Under the "[sdl]" section:
output=(overlay, opengl, openglnb, ddraw)
Twiddling with the above settings can increase the quality of the graphics, especially for natively low-res mode games (like DOOM, that natively runs in 320x200).