I don't have a fair comparison to put ranking order of these because alot of cans i've heard were on different sources but i can desribe my experiences.
AKG 240 Sextetts [Very uncolored and neutral, range is as flat as ive heard other then from the 320ohm monitors.]
AKG 240 Monitors 320Ohm [Very similar to the sextetts but take ALOT of good power to drive them to high volumes, great reference can if you have the power]
Sennheiser EH150 [Good punchy sealed can with quality mids, highs struggle to keep up, i used them for pc gaming with great success ]
Sennheiser HD500 [BASSY, oringally when i bought these i thought they were broken they were so bass heavy especially for an open can, after tweaks and adjustments i was able to control them properly and they can sing but have the same problem as i find with most lower end sennheisers, distortion comes into play at higher volumes]
Sennheiser Hd595 [Better control and bass then the 500's little smoother across the full range, at the right price used they are a good can, retail doesnt reflect value]
Sennheiser HD600 [Good for me as i like dark backgrounds with low noise floors however the vail effect is there if you compare them to akg or grados, but for smooth liquid mids and and overall quiet can, these are fantastic highly recommend them for classical and jazz listening]
Sennheiser HD650 [Basically the 600s without the vail, superb can would recommend for anyone with good amped power]
Grado Sr60 [Good can for the money but without good source these things will reveal way more flaws then youd like, very unforgiving can especially in the highs, great potential though]
Grado Sr80 [Now some people figure its not worth the jump in price for the "same can" totally disagree, this is where you should start your grado journey if you are going to take it IMO, music comes alive and live albums are nearly impossible to tell its not right there, i got up and turned around in the room 3 times looking for people listening to patty barbers xrcd, just floored me, keeping in mind it was being used with a pathos amp
]
Allesandro MS2 - An improvement on the sr80s different sound, i prefer the bass of these but the highs of the sr80s myself maybe because these are a little more forward, also these are pretty heavy cans and i find them rather uncomfortable in long listening sessions where the sr80s are very comfortable, mostly due to weight i suspect, still ms2 is a great can for the money]
I havent got a chance to audition anything really superb yet as i am a deal hunter and i find it hard to spend the amounts of money some people spend on here for headphones. However i think this is largely due to the uses of the cans in my case. I have very good 2ch and multichannel speaker systems and it is not necessary for me to hook up cans to either very often, so most cans for me are portable, very hard to swallow the pride and walk through the mall with hd650 space pods strapped to your head trust me
However, the instant i have an opportunity to audition better cans at a good price, i always hop on it