I found the HD660s new , at 360 Euros with shipping included. T1 mk2 new is around 750 Euros 
The used LCD2 is starting at around 500 Euros without shipping.
I recently was able to pick up a used set of Sundaras, and I love them. For my ears, the Sundaras are great for just about all music, but I do like them them for gaming. My current headphone set up is Sundara for most listening, Phillips Fidelio X2HR for gaming, DT770 when I need to block out noise.
I guess my point is if you want a do-it-all set of headphones, I don’t think the Sundara is it (even though it is a terrific headphone).
Personally I would say go lcd 2 at that price imo, and if you wanted less go senn
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Indeed, the Sundaras are not the all arounder. That will be the DC Aeon 2 Closed, but I don’t have right now the budget for those
I will check further for some used LCD 2 with the classic headband…
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Where do you even find an LCD-2 for 500 euros?! That’s way cheap…
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I was looking here: https://www.hifishark.com/model/audeze-lcd-2
But indeed, even at 500 Euros is hard to find something
P.S. Found an Audioquest NightOwl (so closed back) in good condition at around 270 Euros. How is it compared to the HD660s at 360 Euros new?
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Do you see any nighthawk carbons out there? The nightowl is somewhat meh imo, but the hawks are pretty special. They would have much more soundstage, a pretty different presentation, more impact overall, not as intimate as the 660, the 660s is going to be more of a bit more neutral and reference, where the hawk is going for a warmer fun sound. Personally I prefer the hawks but they aren’t for everyone, and it’s also not the most apples to apples comparison where the 660 is a more agreeable headphone for most and more leaning reference where the hawk is leaning for enjoyment
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The issue with (what I’ve seen in reviews) is that the night owls are more or less just normal headphones. A trusted not forum source confirms what M0N is saying about the night hawks being fun. Still, do some homework but it’s really hard to say Audioquest and not consider the Night Hawks.
In the end I chose the 660s to be on the “safer side” with the sound
Today they should arrive. I’ll come back with the feedback 
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Nice, hopefully you enjoy them, curious to see your thoughts 
The 660’s were my next headphone after the 770 250ohm too.
Coming back with a short update:
I received them and I paired them with the Questyle CMA400i …
- the sound is more intimate, you can hear the voice right there in the front line (it’s quite an experience to be honest)
- the imaging is awesome (I didn’t play any game yet) … but on “Amber Rubarth ㅡ A Kiss to Build a Dream On” , I could really hear the breath and the position of the people playing at instruments.
- I simply love how instruments sound
- It has bass …I was afraid that it will sound flat for my taste
. For example on The Prodigy - Invisible sun … the bass is very present and overall sound it’s wider. On DT770Pro it was a bit muffled.
As a downsize , the clamping force is a bit strong but it is evenly distributed. I placed it over my Monitor Audio Bronze 2 speakers and it’s a bit loose now. I will leave it during the night and see tomorrow how it is.
I’ve never had an open pair of headphones and it was a bit tricky at the beginning (after more than 7-8 years with closed ones), because I could hear myself when moving on the chair , and different noises in the house 
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Glad you are enjoying them 
You can bend the headband metal to reduce clamp if needed, works pretty well, here is an example from diyaudioheaven. Also the pads will get softer and with more use it should get more comfortable
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Another update: to remove the pressure on my jaw I tried to bend it like in the picture above and kept them stretched out on my speakers for 4-5 days. The pressure has released, but it is still present. Also the pads are not very comfortable.
I like the sound but I cannot adapt to that discomfort that those are creating after a couple of minutes.
I can buy some Dekoni pads which are comfier, but those are another 60-70 Euros and the shipping is uncertain right now due to corona virus 
Therefore, I’m thinking to return them (I have 30 days to return them)
I really like the sound, I don’t have any complain. Only the discomfort… 
I can say from experience that the clamping pressure will go away, but it’s your call if you can tolerate it now or not. The great thing about Sennheisers is that they will last forever. You won’t be worried about the clamp if you still own them 7 years from now
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If you like the sound I’d keep them as long as possible… the pressure will continue to diminish and they get seriously comfortable… also do the bendy thing a few times a day or two apart… glad you’re liking them otherwise… also pad swapping sennheisers isn’t highly recommended
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Yes, I saw that changing the pads is going to change the sound. Each type of Dekoni pad has it’s own signature.
When I switched back to the DT770, the softness of the Beyer stock pads was striking This is exactly what I miss on the 660s
I do not know the availability of the DT177x Go in europe but my suggestion for you would be either those or just go DT1990s. Both are excellent headphones that will have a sound signature, build quality, and comfort of something you already know you love.
Yesterday I’ve returned the 660s. Now I’ll restart the searches . I think I’ll stick to Aeon2 Closed.
I found this review, where the “open” model seems to be better than the “closed” one.
- I like that the open is more aired but this is due to the build.
- And also I think the ears will not sweat during hot summer days
- On the other side, regarding the closed ones, I have a pump noise (from the video card) which I could hear it through 660s. So on the Aeon 2 Open ones, probably I will hear it also
The Aeon Opens really sound more semi-open. Much more isolating than the 58x (closest 660s point of reference I have).