To answer the earlier question, I am looking for the obvious albums I have somehow missed and would be shunned if you guys knew I didn't have (although I'm not going to tell you which ones they are as I realized them!). As an example, I have one Pink Floyed album, and it isn't DSOM (although at this moment I have realized my error and will soon be visiting the store).

Although I have a great deal of "best of" albums already, in my minde these don't count as classics because they always (ok, there really are a few exceptions) lack the cohesieveness that the origional albums have.