My three favorite bands come from the Progressive/Symphonic Rock family tree: Muse, Evanescence, and Within Temptation. So I suppose I'll go with Progressive and Symphonic Rock.
Stairway to the Skies by Within Temptation
Lost in Paradise by Evanescence
Exogenesis Symphony Part 1: Overture by Muse
I'm also a big fan of film scores, especially orchestral scores. I'm listening to The Dark Knight Rises by Hans Zimmer right now, and it's fantastic.
On Thin Ice by Hans Zimmer (The Dark Knight Rises)
Rise by Hans Zimmer (The Dark Knight Rises)