I am convinced that there is no other version of the Bible that must be read other than the King James Bible (1611). It may be difficult to understand, yes, because it is written in old English. All the other versions have been translated in order to make it easier to understand but in reality, most of the verses have changed in meaning because of the translation. An example would be from John 14:2 NIV "My Father's house has many rooms; if that were not so, would I have told you that I am going there to prepare a place for you?" compared to the King James Version's "In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you."
You can plainly see the difference. Rooms versus mansion, an uncertain statement versus an assurance from Jesus himself. Other versions have omitted the blood of Jesus and its power. It has omitted plenty of versus from the original Hebrew and Greek text.
I would really suggest that you would ONLY read the King James Bible. It is the perfect, inspired, and holy book of God.