Lord of the Rings Series -- Amazon

i think Sauron really wrestling with wanting to be good is going to be significant to the story

He's Loki. Or Loki is him. He thinks dominion is the way to get the power he craves, but also serves in everyone else's best interests. And (not Loki) He's the greatest craftsman. Everything he creates is amazing, so why wouldn't everyone want his amazing stuff, his way, and his way only?
Actually, he's Hitler. Nearly everything in the trilogy is an allegory to either WWII or Catholicism, often both. So the way they portrayed Sauron as "wanting to heal Middle Earth" jibes quite well with Tolkien's original intention. After all, Hitler (according to him) was "healing" Europe by purging the non-Aryan races and eliminating all the people with "undesirable" traits or "incurable" health issues.
A whole lot of people bought into that insanity, and not just Germans. Fascism was very popular throughout many European countries, and in truth it took the emergence of Hitler and Mussolini to show them what fascism really is. Of course, a great number of people in Germany, Italy, and Spain still thought it was the right answer right up to the end of the war. Fortunately, the others in those countries and the rest of the world (sans Japan) overpowered them.

Anyway, the series has been interesting, though with obvious canonical difficulties that have pointed out by many so I won't repeat. I have enjoyed some of the characterizations and the actors (and some less), particularly Prince Durin, Elendil, and Elrond.