So I'm listening to Live in Berlin (Depeche Mode...Christmas gift from a good friend) and holy moly does this sound outstanding through the LCD-X. The bass is so visceral, fast and detailed...the mids luxurious and the treble extended and smooth. It's like it's 1989 again and I'm back at a high school dance. Personal Jesus sounds as good as it ever has!
If you like sparkly highs, then the TH-600s would be the way to go (I own the TH-900s). But the Z7s have more "natural" overall sound and the mids on the Z7 are better to my ears. The TH-900s have better bass and soundstaging.