RC Sproul is a great professor of reform theology. He describes the RCC's positions and is fair in his representations. However he still is clear that the RCC is in error regarding scripture. He is Masters level teaching and can be down loaded and listened to off his web site.
http://www.ligonier.org/ His past radio shows are archived here.
http://www.ligonier.org/radio/archive.php
The one about invincibly ignorant is not available now, but I could send you the MP3 of it. Its called the Church and Salvation parts one and two.
He goes through a lot of Church history.
He points out the massive back peddling that is required every time the RCC opens its mouth. Very educational.