I think those are good books, though you should buy this (http://www.amazon.com/DC-Universe-Stories-Alan-Moore/dp/1401209270/ref=sr_1_1?ie=UTF8&s=books&qid=1279505562&sr=1-1) instead of the Killing Joke tpb since it has Killing Joke as well as all of Alan Moore's other DC stories which are worth reading and a much better value than a book that is just a 60-page short story.

Also you should probably get The Dark Knight Returns (http://www.amazon.com/Batman-Knight-Returns-Frank-Miller/dp/1563893428/ref=sr_1_1?ie=UTF8&s=books&qid=1279505803&sr=1-1) and Batman: Year One (http://www.amazon.com/Batman-Year-One-Frank-Miller/dp/1401207529/ref=sr_1_1?ie=UTF8&s=books&qid=1279505831&sr=1-1) if you want to go ahead and complete the canon of must-read Batman stories.