Well first off - a different color please! For people like me who like using the "night mode" theme it is nearly impossible to see! I had to turn up my brightness nearly all the way. So keep in mind my opinion might be different than what a person using the standard theme might see.

As for which I like most: I'd take the fourth one. The first one is also good though. What I liked about the fourth font is that it is still large enough to be legible, but it is somewhat different than what I think I see most of the time.