For me my list would go like this.....

1.)Led Zeppelin IV (Zoso) - It basically changed my life in the way that i think about music and writing music.....it still gives me goosebumps when i listen to it.

2.)Band of Gypsys - It defines the style i chose in my guitar playing, and not to mention Machine Gun has one of my favorite intros of all time.

3.)Wish You Were Here - ....enough said.