Some good ideas, but needs MAJOR tweaking
First off, let me say I cringe at your choice of chord progression. You couldn't have used ANY others? This whole idea of transitioning to the fifth that is constantly used in dance songs is overrated and abused beyond belief.
That being said, while this isn't a dance song in the slightest, I still can't say I enjoy hearing the same musical idea in a different genre.
Secondly, the orchestral voices you are using are painful to listen to. Obviously i'm going to be biased since i'm using a relatively similar VSTi (unless you are using Edirol as well, as I noticed several familiar sample stock sounds like the drumroll, gong, et al) but seriously. They sound shrill and synthetic.
Thirdly, your melodies have NO dynamic range. They do not convey crescendos or decrescendos and anyone with a musical background will notice that these lines sound static and plain when they should sound dynamic and flexible. The tuba hits in the slow section are particularly out of place. They have too hard of an attack and take away from the plucks.
On a final note, you should realize that i'm going to criticize you as harshly as possible, as you are my competition. Please take what i'm saying as a way to improve. That being said, this is a fairly good piece of work, but at the same time needs a great deal of improvement.
Thanks for reading and please feel free to critique my work and the other contestants'! :]