I see from your profile that you are a Catholic, therefore the KJV is not recommendable. It is a Protestant translation that is missing seven Old Testament books–called the Deuterocanonicals (or the Apocrypha, by Protestants). These books were removed during the Reformation and are not found in most common editions of the KJV or any other Protestant Bible.
The Douay-Rheims is an older Catholic translation that came out in the 1500s–before the King James. It was translated from the Latin Vulgate, which is the official Bible of the Catholic Church. It is written in sort of the same Old English style as the KJV–and there is some talk now that the KJV took large sections from the DRV.
The Revised Standard Version-Catholic Edition is a more modern translation, and is a fairly good one–provided you get the Catholic Edition with the Deuterocanonicals. The RSV was originally a Protestant translation, so some editions don’t have the Deuterocanonicals.
The New American Bible is also a modern translation, published in 1970 by the US Conference of Bishops. It is a decent translation, although it has numerous deficiencies. It is currently used in the Lectionary for the Mass in the United States.
For more, consult
www.catholic.com There is an excellent article about Bible translations under the Bible heading.
Hope this helps!
-ACEGC