Did everyone forget about The Last of the Mohicans? If you ask me, it is a timeless classic at this point, and one of the best soundtracks.
It is, IMO, incredibly hard to make a top ten since there are so many awesome soundtracks.
But the top Fourteen for me in no particular order is:
Lord of The Rings Trilogy
Gladiator
The Last of The Mohicans
King Arthur
Rain Man (The Hans Zimmer bits)
Michael Kamen - Highlander theme
Band of Brothers
Last Samurai
StarWars
Pirates of The Caribbean
Escaflowne
Spirited Away
Princess Mononoke
Don Davis - The Matrix