one of the most important Bible commentary recommendations I could give you would be the following — don't make the mistake that so many hands in purchasing a Bible commentary that is familiar and easy to use.  Instead what you want to do is purchase one that is a bit beyond your present abilities.  In other words, purchase a Bible commentary that you can grow into — one that will be a bit of a challenge for you to use, one that will "stretch" you, both intellectually and spiritually.