Recommend BATMAN please!

Here is my Batman tpb collection. I just got paid, and I'm going to the big comic book store today to splurge. What big Epics/ Weird tales do you recommend I look for? I have all the DC Metal stuff already, they're just not pictured.

I like dark, gritty, violent, disturbing, but also mystery and detective mode Batman. Not really a fan of the early early days...