I like Hirsch’s tiered approach, so I will list my favorites within the confines of that format:
Tier 1:
HE90 (never heard it but it’s the Orpheus so it automatically reserves a spot here
)
MDR-R10 (my favorite dynamic headphone – listen to it with a great tube amp like the Supra)
Tier 2:
K1000 (a very unique sound that is captivating and a midrange that is sexy)
L3000 (better than the W2002 but not worth the price to me)
PS-1 Pro (the detail of the HP-1 with the groove of the RS-1, but it IS a tad overwhelming in the bass department; I grew tired of its approach rather quickly)
HP-1 (faster and more accurate than the PS-1, IMO; however it’s not “fun” to me)
HD650 (my personal favorite dynamic after the R10; with the right balanced system it can reach Tier 1, IMO)
Stax Omega II (this ‘phone does amazing things when connected to the WEEBL, and though it approaches Tier 1 in certain regards it just doesn’t “do it” for me)
Tier 3:
W2002 (it’s good but too slow on leading edge of notes and sounds a bit hollow; the L3000 fills it up nicely)
DT880 (in some areas like treble extension it’s superior to the HD600, but it has a dry midrange, IMO)
RS-1 (a fun, forward headphone that has great resolution but it’s a bit unnatural to my ears)
HD600 (another one of my favorites – I admit my Senn bias – it does have a mid-bass hump, however)
MDR-CD3000 (a detailed, impact-full headphone that is just too artificial-sounding for my tastes)
SR-404 (sounds close to its Omega II brother, but it doesn’t quite exhibit the same control of bass to ascend to Tier 2 IMO)
Tier 4:
K501 (details, sweet midrange and wide soundstage; it lacks REAL bass no matter how much break-in is applied and what amp is driving it – I don’t care what the AKG Mafia threatens!
)
A1000 (a fast, detailed headphone that has a “wrong” midrange IMO; it’s still better than the W100 and W1000, however)
DT531 (more natural than the DT931 or even the 990-600ohm but its sound bored me after several months)
MS-2 (a detailed ‘phone that features tight bass and nice mids – it’s still too bright for me…damn Sennheiser acclimation…)
HD580 (approaches the HD600 in nearly every way but still lacks that last shimmer in the treble – an excellent hi-fi entry set of cans)
I’m too tired to list more tiers…Remember this is just my experience and opinions so don’t be offended.
P.S. Perhaps the Qualia 010 is in Tier 1 or 2, but I haven’t heard it yet.