So true... few phones (if any) make the music sound as "real," or "live" as the PS1000's, PS500's and RS1's. Though, the AD2000's, the D5000's / D7000's (with Markl Mods) can come very close. I haven't heard this same sound quality in Stax, or planar phones - though, that may have been the result of poorly matched amps I was using. Regardless, the Grados are much easier to match to a set up to achieve their "realistic" sound.
I really want to hear those Denon phones at some point...I came really close to pulling the trigger on the 2000s, but went with Beyer 1350s instead. I've heard the Denon cans are great, though.