A legit release of Graeme Revell`s Dead Calm. That`s the score that made me a fan of film scores and it is because of that score I now have over 2000 CD soundtracks but that one is still missing.
The two I agree with most (that have been mentioned here) are Polar Express and Horner's Romeo and Juliet. Being that we are asked to pick just one, I will choose Polar Express.