OK, lemme give this a shot.
Top - These are the headphones that right now i can remember really thoroughly enjoying with few to no disappointments:
ECR-500
DT880-S (Edition 1980)
DT990 (Edition 1990)
K240-DF
K240-Sextett MP
Yamakoax (ortho transplant of my own construction)
Almost Top - Still excellent, nothin wrong with them, magic less than complete. Deserve to be in the "top" list except for my own neurotic issues:
T40 v1
T20 v1
T50 v2
YH-100
QP85
SR-X III
Pro 30
K240-M (early)
DT770 Pro/80
Middle - Still real good. Many enjoyable hours:
SR-80 Pro (Stax)
SR-30
DT250-80
K340 (bass-lite) (That's right, you heard me. MIDDLIN.)
HOK 80-2
Fair - no complaints:
K260 Pro
HD25-SP
QP55x
Meh - meh:
Pro4AAT
ATH-A900
This list will probably get edited as i change my mind, remember headphones that aren't mentioned here, etc.