Leader vs. Elder or Overseer

My ESV only uses the English word "leader" twice in the New Testament. One is specifically in reference to Jesus:
"God exalted him at his right hand as Leader and Savior, to give repentance to Israel and forgiveness of sins" - Acts 5:31 
And the other is a warning to him who sees himself as a leader. That he should become as one who serves.
"But not so with you. Rather, let the greatest among you become as the youngest, and the leader as one who serves." - Luke 22:26
This is pertinent because when we read Titus, or the Timothys and read about the qualifications for elders and overseers, it's interesting to consider our cultural understandings (or perhaps misunderstandings) of these words.

A leader has authority over people. An elder is an example, not a leader. His role is to speak and live truth. How is that different from your concept of a leader? Or, perhaps more importantly, how proud are you to be a leader instead of an elder? And what do you find in the scripture about the kind of person you should be? Maybe the Bible is clear about it in Acts 5:31. Then again, I've yet to look at the original words to see how they're translated... Thoughts?