Obviously Ascension isn't a big fan. They have a compilation called Hymns To Victory that spans most of their older albums, which would be a good place to start. If you're dead set against compilations for some reason I'm partial to Invictus.
Others will suggest The Marriage of Heaven and Hell, or The House of Atreus albums. I've also seen recommendations for Noble Savage... all good IMO.
The newest album has some good songs, but is a bit different than the others in the way it's mixed. They keys are very prominent which is a bit of a distraction for me.