Have (and like a lot):
ATH-W1000, the most comfy closed headphone I`ve ever tried. I also love the sound, with some subtle Eq these really sing!
Sony MDR F1, the most comfy open headphones I`ve ever tried. (As you can see I value comfort highly, as I often spend hours listening).
AKG K501, nice, but at the time I also owned the magic K1000 so...
AKG K1000, absolutely magic midrange and treble, super detailed, but sadly the lacking level of bass just couldn`t do in the long run. Also the most demanding set around of source and amp.
AKG K270, not that good really.
A bunch of cheap Sony/AKG stuff, nothing worth single out.
HD600, nice sound, a bit mellow maybe, didn`t like the design/comfort.
Grado 325, wow, really upfront warm engaging sound, absolutely hated the complete lack of comfort!
K340, as I can recall, really good at the time (ca 1988), but I couldn`t get the money needed.
Would like to test/get:
Beyerdynamic DT770 and DT880
Stax SR-007 system
Time for an update.
Had but lost:
SE530 (boohoo for me - also lost my iPod Nano)
Something from Stax
Some Audio Technica Woodies (cause they're purty)
Darth Beyer V3-C-O
Beyer DT880 (2003 model- I think they look hawt)
lol i want to try everything. easy question. but if i had to pick something in particular now, i want to try high end senns with a good amp. like the 650. oh yea and it better have good cabling so i can hear it in it's glory.