4: An Ordinary College Sex Life by bluedragon The entire Ordinary Sex Life series by BlueDragon is an excellent example of a harem story with interesting characters. And another very long series.
5: A Fresh Start by rlfj Another “do over” story, but well written and long.
6: Aftermath by Al Steiner Another longer favorite. I wish it had continued even further. A fresh start story with a good premise and well written story.