William Lane Craig is a personal favourite of mine - I very quickly turn to his notes/research/debates if I want a great example of offensive and defensive apologetics. His knowledge of the bible as well as his in-depth knowledge of philosophy and most of the sciences are astounding. A great read for any Christian with a desire to especially worship God with their mind! :)
This work covers most of Craig's apologetical arguments. Craig is a top notch debator, apologist, and christian philosopher. This book together with his recent work, "On Guard" will equip one to "give an answer for the hope that is within us" while likewise giving one insight into the problems with other major worldviews.