Are we talking all-time, or just the past 5-10 years? Here's my collection:
1. Air Force One
2. Amistad
3. Antz
4. Assassin's Creed
5. Atlantis: The Lost Empire
6. Batman Begins
7. Batman Returns
8. Batman: Mask of the Phantasm
9. The Beast
10. Beowulf
11. The Big Lebowski
12. Black Hawk Down
13. Broken Arrow
14. Charlie and the Chocolate Factory
15. The Chronicles of Narnia: The Lion, The Witch, and the Wardrobe
16. Collateral
17. Con Air
18. Congo
19. The Count of Monte Cristo
20. Crash
21. The Dark Knight
22. Deep Blue Sea
23. The Departed
24. Dinosaur
25. The Fifth Element
26. Finding Nemo
27. Gangs of New York
28. The Ghost and the Darkness
29. Gladiator
30. The Green Mile
31. Halo 1, 2, & 3
32. The Happening
33. Harry Potter & the Prisoner of Azkaban
34. Harry Potter & the Goblet of Fire
35. Harry Potter & the Order of the Phoenix
36. Hitman: Silent Assassin, Contracts, and Blood Money
37. Independence Day
38. JAWS
39. Jurassic Park
40. Kill Bill Vol. 1 & 2
41. King Kong
42. Kingdom of Heaven
43. L4yer Cake
44. Léon: The Professional
45. The Lion King
46. The Lord of the Rings Trilogy Complete Recordings
47. The Lord of the Rings: The Battle for Middle-Earth I & II
48. The Lost World: Jurassic Park
49. The Matrix Trilogy
50. Mission Impossible 2
51. MobyDick
52. Pirates of the Caribbean Trilogy
53. Predator
54. Road to Perdition
55. Signs
56. Sleepy Hollow
57. Snatch
58. Spider-man Trilogy
59. Star Trek II: The Wrath of Khan
60. Star Trek: Generations
61. Star Wars Trilogy & Prequels (Complete Score of Episode I included)
62. The Sum of All Fears
63. There Will Be Blood
64. Transformers
65. Trespasser: Jurassic Park
66. Troy
67. Unbreakable
68. The Usual Suspects
69. V for Vendetta
70. Vertical Limit
71. Virtuosity
72. X2
73. X-Men 3: The Last Stand
74. 3:10 to Yuma
75. 300
Unbreakable may be the all-time favorite for me. Hard to say when throwing such scores as TDK, Jurassic Park, LotR, Jaws, Road to Perdition, & PotC into the mix. Not to say that any one is better than the other, but some are simply more emotional and iconic personally. Favorite composers would have to be Hans Zimmer, James Newton Howard, Howard Shore, Thomas Newman, and John Williams. Though Harry Gregson-Williams, Jerry Goldsmith, Alan Silvestri, and Tyler Bates are magnificent too!