The best font in the world is included in LaTeX: New Century Schoolbook.
Don't let the name fool you, the font is optimised for readability which means you can drop the font size and it will still be easier to read than CM at a higher font size but you get more space to work with.
Don't let the name fool you, the font is optimised for readability which means you can drop the font size and it will still be easier to read than CM at a higher font size but you get more space to work with.