Best Movie Scores

Pirates 1 and 2
LOTR trilogy
All 6 Star Wars
V for Vendetta
Batman Begins
Harry Potter and the Goblet of Fire


in that order.

Indiana Jones Trilogy
Mummy Series
Laura Croft Series
The Rundown
Sahara
King Solomon's Mine (2006 edition)

Titanic - James Horner
Pirates of the Carribean: The Curse of the Black Pearl - Klaus Badelt
Braveheart - James Horner
Gladiator - Hans Zimmer & Lisa Gerrard
Legends of the Fall - James Horner
Indiana Jones - The Last Crusade - John Williams

Schindler's List
Harry Potter & The Prisoner of Azkaban
LotR Trilogy
Indiana Jones Series
Gone With The Wind

Braveheart
The Lord of the Rings Trilogy:I was lucky to see the music of the LOTR concert that toured the world, unfortunately Howard Shore didn't conduct the one I saw!
Star Warsarticularly The Empire Strikes Back and Revenge of the Sith(Duel of the Fates and Battle of the Heroes)
The Indiana Jones films: Raiders first, then TOD(one of my favorites), and LC
Gladiator
Hoosiers(sentimental favorite)
The Last of the Mohicans
Bladerunner
Superman:The Movie
Jaws
E.T.
The Goonies
The Bourne Identity and Supremacy
Moby's song from Heat recently used in Syriana: I know it doesn't count as a complete score but it's a great piece of music
Jurassic Park
John Carpenter's films: Halloween and his 80's hits
The Last Samurai
I know there's more but my mind is going blank

John William's score for Superman and Howard Shore's work on The Lord of the Rings. Those are perhaps the two best non-Indy-series scores on the planet.

Other good scores are:

Titanic
King Kong (1933 and 2005)
Gojira
Jurassic Park
Star Wars
The Mummy
Van Helsing
Sahara

I'll think of more later.