Started working through Exploring Black Holes: Introduction to General Relativity and I must say I am fairly impressed with the way the authors avoid making the text dry (even geometric mass was made understandable). The authors say that Black Holes and Times Warps by Kip Thorne and Stephen Hawking is a "companion" since it continues along with some questions their text doesn't expound on. As a little gift to myself, I ordered Spacetime Physics and Black Holes and Times Warps. Judging from Exploring Black Holes: Introduction to General Relativity, Spacetime Physics should be an excellent read.