The John McArthur Study Bible is a great reference tool wrapped around the Bible. For those unfamiliar, John McArthur is a well-known, strong Christian advocate minister and writer and has written a number of books in support of the faith.
The Study Bible he published is simple-references to the verses are listed on the bottom of the page along with his opinion/ideas behind the meanings. John McArthur uses the Bible to help support itself, all of his ideas are not necessarily his own but are the result of careful research and work. The maps, charts and graphs are also very helpful-I have used them fairly often in classes.
Overall, this is a great reference Bible for anyone looking to learn more from the faith and how to understand the information the Bible presents.