I have seen Un Chien Andalou, which I liked quite a bit. I haven't seen Metropolis, although I think the Tivoli, which is a theatre near the city I often visit, does midnight showings of it. I'll have to catch it.
There are some great Film Noirs and some cheaper ones. I've stopped watching most older films recently since my aunt died (who I always watched the noirs with). These days, I'm basically watching only new indie flicks (I've been disappointed with Hollywood as of late).
I've got a ymbd page that has my top twenty films, although I don't update it much and there so many films I love that I don't have room to fit in on it. But give it a look
anyhow. I really need to re-fit it and add The 25th hour, The Snake Pit and the first Star Trek movie.