Justification & Regeneration by Charles Leiter is now available for purchase in an updated second edition. I cannot recommend this book highly enough, so if you missed out on the first batch, please pick one up now and read through it slowly and prayerfully, taking the time to look up and meditate on the verses quoted. I have no doubt that this book will be a tremendous help to you.
Here is Mason's personal review of the book posted on the blog several months back.
HT: Scott S.