Yeah, the counterpoints series is a GREAT introduction on each of the five major apologetic approaches.
Return to Reason by Kelly James Clark is a fantastic book on the virtues and methodology of Reformed Epistomological apologetics
If you've noticed my username, you'll see I'm a proponent of Presuppositional apologetics. For a great introduction to it, I recommend Matrix of the Atheist by James D. Lashley
and for a more in depth review and understanding of both the negative (deconstruction of a non trinitarian worldview) and positive (construction of the trinitarian worldview) argumentation I reccomend Greg Bahnsen's book Always Ready
If you or anyone else who happens upon this and doesn't have the means to purchase either one of the presuppositional books, PM me with your address and I'll gladly have one or both shipped to you (though they may be used).
Hope you enjoy!