Infernal Affairs. It's pretty good but I don't know how I feel about it. I've seen Departed (and loved it) and it was a blatant ripoff of IA, I'm guessing that makes IA really good too.
I ain't thirsty. There's plenty of fish in the sea, but I don't want all of them, can I have some standards? Or do we just have to settle, for someone's who meh and will do.