This was my main reason for finding the right monospace font for me too, and to easier differentiate O and 0—I prefer a bar across the zero instead of a dot.

But now that I’ve been using Inconsolata for years, it has become my final choice* so I won’t need to waste my time hunting and comparing for a better font. Done deal.

* http://patrickrhone.com/2010/11/05/final-choices/