I like reading chapters where they are unabridged by anyone else, because it gives us a different writing and speaking style by someone. A lot of times there are also speeches recorded directly from angels, whose words are going to be the most unaltered, save those spoken directly by Jesus. It's good to be able to see these, and get a different perspective.
This list is incomplete, and just covers the Book of Mormon for now.
Mosiah 2 - King Benjamin's final speech, chapters 2 through 5
Mosiah 9 - Book of Zeniff, chapters 9 and 10
Mosiah 11 - Abinadi's prophecies, chapters 11 through 17
Mosiah 29 - King Mosiah alters the government from monarch to judges
Alma 5 - Alma speaks in a general conference
Alma 7 - Another speech by Alma in a general conference setting
Alma 10 - Amulek preaches to the people of Ammonihah
Alma 11 - Amulek contends with Zeezrom
Alma 12 - Alma contends with Zeezrom, wicked rulers, speaks to general population, through chapter 13
Alma 26 - Ammon bears his testimony
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Helaman 13 - Samuel the Lamanite preaches in Zarahemla, chapters 13 through 15