HD600: My favorite. They do everything right though pressure makes them slightly uncomfortable. A benchmark phone.
K501.1: K501 with K701 pads. A whole new ballgame. They're nearly as good as K701s yet more comfortable than HD600s or K701s. BP
K701: World class sound but lumpy headband makes them uncomfortable and it takes far too long to make them sing. BP
KSC-75:They shame far more expensive phones. BP
CX300: Love their comfort but tutti fortissimos blast them to oblivion.
E888: Yeomanlike sound. A comfortable and easily removable portable phone.
Have but don’t use very much:
Lambda Pros: World class sound but rarely listen to them because they're a hassle to set up. BP
US2200: Interesting but certainly not in the top three.
Ety4P/S: Sound great but potential tinnitus makes me stay away. BP
SR60: Surprisingly good even after 15 years. BP
IM616: OK. Kept them because they're cheap.
Eggos: Cute...well they’re cute.
Tried and returned:
325i: Limited SS and obvious HD600 superiority made me give them up but they’re still fun phones.
SA5K: Poor fit and strange sound make them way over priced at $370.
IM716: Sound too much like IM616s to keep.
iGrado: Muffled sound and very uncomfortable design. Returned after 15 minutes.
PX100: Muddy sound lacking sparkle.
AT Woody clip-ons: K501 like sound and seductive appearance but they wouldn't stay put so away they went.
Resistance is futile:
Stax SR-001 MKII: Must buy soon, today?
Curious but not curious enough to buy:
AT AD900: A pretty yet perplexing puzzle.
AT AD2000: An expensive lateral move?
Beyer DT880: Curious, but think I already have similar, but even better sounding phones.
RS1-2: Tempted, but are they just highly refined SR60s with an extended bass and a smidgen of sparkle thrown in to justify their exorbitant price?