List: Top 5 Hollywood Classics I Still Haven't Seen

I thought it would be interesting to take a break from my lengthy reviews and post a list or two.
The idea for this one came to me almost instantly as I'm always feeling guilty about having not seen these films, but for some reason never watch them or even make any effort to get hold of them.
I don't know why this is, but I do know that I'll have to watch them sometime as they are all massively important films especially from a cultural point of view, they are classics in the truest sense of the word.

Classic Hollywood has never really been my cup of tea anyway, I much prefer the work of the Hollywood New Wave, or even the Pre-Code films. But I'm often left unimpressed by the so called classics of the 40's and 50's. Maybe that is why I have never made the effort to watch these films.
Anyway, enough rambling, here are my choices: