Well, The Shawshank Redemption is a masterpiece, it's listed as the #1 greatest movie of all time on many publications, including IMDB. Watch that ASAP, make it your #1 priority.
Harry Potter, 300, Secondhand Lions, The Lord of the Rings, Kill Bill, Pulp Fiction, From Dusk Till Dawn, The Postman, John Q - are my suggestions for the moment after you are done with Shawshank.
I have seen 300, both Kill Bills, Pulp Fiction and John Q. I have seen about 90% of Lord of The Rings. Also I have seen Forrest Gump and Saving Private Ryan.
But I need to check out the rest.
I should have asked people to list there favorite all time movies or top movies for each genre.