What is the best study Bible in English?
If you’re looking for a good New Testament study Bible based on a major modern English translation of the Catholic Bible that reflects the original languages, then the Ignatius Catholic Study Bible New Testament is for you. The Old Testament companion has yet to be published. However, individual volumes of this study Bible, including both Old and New Testaments, are available for purchase.
The Didache Bible—Revised Standard Version, Second Catholic Edition is another option. It includes both the Old and New Testaments and offers excellent commentaries all based on the Catechism of the Catholic Church.
Then there’s the Douay-Rheims Bible, which is a literal translation of the Latin Vulgate. One particular Douay-Rheims edition (Haydock) has an Old and New Testament Bible with commentaries, which would be good for study.
There are many more good study Bible's available, both in print and online, but these will get you started.