Day breakers was pretty good and i haven't seen the other one. Also Twilight kinda...sucks.

Let Me In is a remake of some Swedish film from like six years ago. I haven't seen the original so I can't compare, but the American version is about a little boy whose parents are going through a bad divorce. He's a bit of a loner and the target of the school bullies. He's outside his apartment alone one night and he sees a little girl sitting in the snow with no shoes. He asks her if she's okay and she says she's fine... but that she also doesn't want to be friends.

He ends up seeing her every night almost on a regular basis and finds out that she lives with an older man who he presumes is her dad. He and the girl become friends over time but it doesn't take him long to figure out that she's a vampire. :P

But I can't give away any more without giving the rest of the movie away. :D