HD800: Very, very good. Didn't use a lot, though.
IE800: Excellent - narrow stage, but amazing realism. Don't use much due to in-ear fit.
HD700: Haven't tried. I expect more for $1000.
HD650: Had the original, same as HD600. New version is supposed to be warmer.
HD600: Good, but bland.
HD580: Bought after rave review in Stereophile. Too distant-sounding.
HD565: Bought to replace HD580. Much better.
Momentum: Exciting at first, but uneven treble could not be compensated on i-devices.
Amperior: Exciting, lush sound, very hard-hitting in upper bass. Tiring after awhile.
PX series: Much better on-ears available from Beyerdynamic (i.e. DTX501p).
From the 1970s: The HD414 was awful, but the 1998 anniversary edition was quite good, although it failed right away. The HD424 circa 1977 was much better.
listening to the 650 -- particularly for its added warmth.