Yet again edited with my lastest findings and also added the Hemp
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Finally did a full comparison of all of my Grado headphones. Maybe it's helpful to someone torturing his brain about what Grado to buy next 
I tested all headphones with a Mojo 2/Poly/Roon, EQ set to neutral but also tried EQ adjustments.
I don't care much about sound stage so i didn't say anything about it. For me they all sound great in that regard anyway.
GH2
- Very balanced across the frequency range
- Doesn't need EQ, works very well with every source i tried it with, even the iPad headphone jack
- No real sub bass, lower bass slightly bloated, otherwise punchy
- Ok mids
- Clear nice treble but not sibilant
- The sound has a certain je ne sais quois mojo, my girl friend loves it and so do i
- Works great with a Dragonfly Cobalt and Mojo 1
GS1000i
- On the muffled side
- Massive yet bloated bass and sub bass
- Very nice mids
- Low treble ok, high treble muffled
- Needs some EQ, the Mojo EQ (someting like +3/-3/+2/-2) makes it edible
- Can sound very nice and serious with the right sound material (e.g. jazz/classic) and EQ, in any case not an allrounder
PS500e
- Very balanced across the frequency range similar to the GH2 but more neutral with slightly more "bottom"
- Every frequency band is there, no need for EQ, because of that it sounds well-rounded or some might say "boring"
- Works well with every sound source
- Sounds like a real Grado but without the classic "downsides"
RS1 button ("Classic", not sure if A, B or C)
- I use it with L pads, this combination does VERY well with an iPod Classic but also with a Mojo 1 and especially Mojo 2 (with EQ someting like -6/+6/+2/-2)
- Defined impactful bass, never bloated
- Very good mids, nearly on par with the WH1 and GS1000i, voices are detailed and stand out nicely
- Great microdynamics
- Really good treble, comparable to the RS2e
RS2e
- Awesome with some EQ (someting like -5/+5/+2/-2)
- Very lean bass but surprisinlgy there is some sub bass
- Pretty, non-sibilant treble
- Good mids
- With EQ very nice defined punchy bass, the treble is great anyway
- Without the Mojo 2 EQ it always lacked something for me but with EQ it's da bomb!
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RS1 button and RS2e compete closely when used with a Mojo 2, every time i switch i think "Oh this one is better than the other". RS1 has a little more detail and microdynamics and RS2e separates things a little better and sounds more "substantial"
SR325e
- Similar to RS2, great with some EQ
- Lean sub bass, bass and mids (but more bass than the RS2e)
- Very good treble and extraordinary high treble (aka "Grado magic") which none of the others have!
- The treble is why you must keep this headphone, great to spot new nuances in guitars!
- Set EQ to someting like -4/+4/+2/-2 so you get a nice bass-ment under those awesome highs
- If it wasn't for that treble i'd say it does nothing better than the RS2e but it's worth keeping around
WH1
- Weird bell-shaped frequency range
- Sounds like a vintage radio which can work well for some kinds of music (Beatles, classic, singing, jazz)
- Very good mids, beautiful for voices
- EQ doesn't really help with the shortcomings
SR80X
- Sounds good on first listen, you get that Grado sound, but compared to the others it's clearly inferior
- The cable looks great but is stiff, I never minded the old cables but this new one is annoying
- Can be used with S- and L-pads. I prefer the L as you get more treble detail, S has a little more bottom and oomph
- Although worse than the others i have it's a steal for the money
- From memory i preferred the 60e, 80e and 225e, this X version has more bass which alas sounds kinda less defined to me
The Hemp
- I use it with L-pads, way too bassy and boomy and muffled with F for my taste. But i can see how someone not used to Grado headphones will love the heavy foundation with F-pads.
- I dial in 0/0/+3/-3 with the Mojo EQ, it sounds very nice then (similar but better than the 80X) but i always have the feeling it misses some details.
- I am glad i have the old version with the old cable and not the monstrosity that the 80X has.
- I am not sure if i really need it as as of now it does nothing better than the others for me, but i will give it more time.
tl;dr
GH2
Buy, you can't go wrong with it, it's magical with nearly every source!
GS1000i
Interesting, different, beautifully made, use for jazz and classic not for rock/pop
PS500e
Buy, you can't go wrong with it.
RS1 button
Awesome with my iPod Classic, a match made in heaven only slightly behind usage with a Chord Mojo 2 where it really shines.
RS2e
Buy if you got EQ or bassy amp, then it's awesome.
SR325e
Buy for the treble, it's cheap!
WH1
Still trying to find a reason why i need it, but it's pretty and special.
SR80X
Great for the money, but rather try the "e" versions or if you have the money get one of the higher up models.
The Hemp
Too bassy/muffled without EQ, similar to 80X but better than it.
Will definitely keep:
GH2
RS1 Button
Will most likely keep:
RS2e
GS1000i (because it's special)
Indifferent at this point:
The White (wouldn't be worth selling anyway)
SR325e
The Hemp
Will probably sell:
SR80X (does nothing better than the others)
Sold:
PS500 (too similar to GH2 and a friend wanted it and it's better that it's used a lot)
