Our tradition at Women's Catholic Scripture Study has been to use the Revised Standard Version-Catholic Edition as our foundational Bible translation for in-depth study. If you do not have a Bible in this translation, the following links will be of help to you:
The Revised Standard Version-Catholic Edition Bible
A searchable RSV-CE from the EWTN website
The New American Bible from the U.S. Bishops' Website
Catechism of the Catholic Church (read it, search it, online):
Here James Akin of Catholic Answers writes about how to choose a Bible translation:
Here is a link to an article on Bible translations from EWTN:
Here is an article about the differences in Catholic and Protestant Bibles from the Turning to God's Word website.