I have about four of their songs on mp3, from various sources. Mostly from a friend of mine who really digs them. I'd say it's a lot closer to prog rock than it is prog metal, although they do rock out briefly in places. From what I've heard, the songwriting is fantastic. It's heavily doused in keyboards, as most prog-rock is and has heavy old-school british influences such as Marillion (their ex-drummer founded the band I think) and Yes.
I think this is right up your alley, Soundmaster. My friend told me to start with Contagion, but that was before the new one came out. I haven't spoken with him about Arena since Pepper's Ghost came out so I don't know his feelings on that one.
NP: Demon - British Standard Approved