Thanks everyone.
I tried the terminal font, and was not too happy with its looks.
Then I found a comment of a font that is used by M.$oft for their "studios" called Consolas, I downloaded it and it is indeed quite nice. It is also monofont, good for lining up numbers (but not too good sometimes for usual text).
It has a backslashed zero, which is alo OK for distinguishing it from the letter "O".
So I'm kind of set and will see if the eyes are OK with that font.
