[blame-troi]

I've been struggling with this lately. My defaults are either 65 (8 1/2 wide paper, 6 1/2 text, leaves an inch either side for notes and hole punch), 72 (usable card image width), or 80 (because terminal were either 80 x 25 or 80 x 43).

My mainframe indoctrination there.

In terms of screen reading width, there's some sweet spot where characters per screen "page" and characters per line are easily readable without the text being "big". I need to be able to move my eyes left to right without losing track of my vertical position on the page.