Excellent Work
I don't like to write a review unless it's something worth writing about, and this song is definitely worth it. It's aptly named; I like how the song changes from intense to calm, but maintains the epic feel the whole time. I love how you aided the melody with the choir, but I think it could have used more variation the second time that section was played, (I mean variation in the instrumentation, not the melody). The tempo changes were smooth, and the dynamics were great. As for the realistic sound that you're going for, I thought it was pretty accurate. Are you using symphonic orchestra gold? Maybe try Hollywood Strings. I can't vouch for the quality, but it might be closer to what you want, (if you can cough up the cash).
On a separate note, I listened to all the songs for the Orchestral NAC, and I hope this one wins, not only because it's my favorite, but because I thought it was composed well too. Good luck, and I hope you make more classical songs like this in the future.