I need some suggestions on what should be my second Blu-ray purchase. The reason I'm saying "second" is because I just ordered Baraka.

I would say that it has to be an action movie, and definitely not a box set, because I don't have a lot of cash to fork out. I just want reference video and audio (something in 7.1?).

That said, I have checked out the top rated list at Blu-ray.com, and they have Sin City and The Dark Knight rated as #2 and #4 respectively. I really enjoyed The Dark Knight, but haven't seen or know anything about Sin City.

Any input is greatly appreciated.

Thanks.