The RSVCE is pretty good. It is a dynamic translation, so it is easy to understand, but it is also a faithful translation (CE stands for Catholic Edition so you get a better rendition of verses like Luke 1:28 as well as all the Deuterocanonicals).
Just remember that a Bible alone is only halfway there.
Philip ran up and heard him reading Isaiah the prophet and said, “Do you understand what you are reading?” He replied, “How can I, unless someone instructs me?” So he invited Philip to get in and sit with him. Acts 8:30-31