ummm well i love all the album openers and to help my undecisiveness is this:
9. We're Gonna Groove
8. Custard Pie
7. Good Times Bad Times
6. Immigrant Song
5. Black Dog
4. The Song Remains the Same
3. In The Evening
2. Whole Lotta Love
1. Achilles Last Stand
and i say the most beautiful are "The Rain Song", "Stairway to Heaven", "All My Love", "Thank You", "Ten Years Gone", and probably "Going to California" and "The Battle of Evermore" from LZ IV (unofficially)