Many of my favourite films have already been mentioned above, so I'll go with others, that I'm very fond of. For a combination of great writing, directing and acting, I submit the following:

1- The Madness Of King George
2- The Prisoner (Alec Guiness&Jack Hawkins)
3- Sleuth
4- Tender Mercies
5- Shall We Dance (Japanese version)
6- My Left Foot
7- Fargo
8- Mash
9- After Life
10-Bull Durham
11-Bye Bye Blues
12-The Hustler
13-All The President's Men
14-Judgment at Nuremburg
15-Play It Again Sam

Favourite Musical Docs

1-The Buena Vista Social Club
2-Standing In The Shadows Of Motown