Re: Comics and Graphic Novels Vol. 2
Chew trades are very cheap. About $7-$9 each. I'd say start with volume 3 since that kicks off the awesone buddy cop stuff.
Get Saga vol. 1. Its $9.99. 2nd trade is out in June AFAIK. Also, check out HAWKEYE. The best Marvel title in a long long long time.
Batman #12 is a good jumping on point. It should be included in the Death of the Family trade.
Otherwise you just need Court of Owls vol. 1 and 2 to get issues #1-11 plus the annual and I think #0.