A lot of things go into a "best album." All the songs have to be good and work together. Most of my favorite songs do not exist on my favorite albums as I have many more favorite songs off of my favorite albums than those on my favorites. Here we go:
A Hard Day's Night - The Beatles
Help! - The Beatles
Revolver - The Beatles
Whatever And Ever Amen - Ben Folds Five
Sunlight Makes Me Paranoid - Elefant
The Colour and the Shape - Foo Fighters
Time (The Revelator) - Gillian Welch
Dark Side of the Moon - Pink Floyd
Automatic for the People - R.E.M.
Weezer (Blue Album) - Weezer
On reflection, this probably isn't the list in all its correctness. At any rate, these are 10 very very good albums that I will not live without.