A last update maybe, to thank you all and tell you that I've made my mind now.
In the end and despite this topic's title, it won't be TWO different pairs of headphones, but THREE. But still within the 1K€ budget.
Honestly I could have gone over that budget, but I didn't found any pair of cans that was appealing enough. Maybe for the 4th pair, who knows.
The two first pairs of cans were relatively easy to choose :
- The Hifiman Sundara as possibly the best "all rounder" headphone for less than 500 €. Great on most kinds of music, especially after the "stealth revision" of their pads which improved frequency response.
- The AudioQuest Nighthawk Carbon, for purely subjective reasons : because it brings bass , huge 3D imaging, and because it's different, and different is generally interesting. Plus it was a steal at 249 € and we got the last one apparently.
The third pair, however, was much more difficult ! We wanted something more intimate and great on vocals, with potential for PEQ.
I've asked for advice, and I've listened to what everybody had to say : here, on other sites (french and foreign), on other reviews, etc.. I've contacted shops, tried to set up appointments for listening sessions, etc..
Of course everybody has an opinion. And it would have been so much easier for me if there was a clear consensus towards a pair of cans for my particular use. But let's face it : THERE ISN'T.
Even only for the Senn cans, some people say the 660S are better, and I understand why (more recent, more technical/analytical). Other people say the 650 are better, and I also understand why. And of course other people say the 600 are better and always have been. There is no clear winner, nor will there ever be I guess.
In the end I think I'll settle for the
Sennheiser HD600. Here's why : it may be a little less "modern" and "refined" than the 660S, it may be a little less "analytical" and "all-rounder" than the DT1990 Pro, but it does the two things I'm looking for on this 3rd headphone : an
intimate soundstage (kind of "in your head") and sounding great on
both male and female vocals. Just for the record, I've also found
yet another video review (sorry) that happens to compare the three Senn cans. The video alone wouldn't have sufficed, but the video plus
many individual opinions gathered here and there over the last few days/weeks have helped me make my mind. Relax, it's only a pair of cans after all.
So the HD600 it is.
I can buy it now for 275 €, while the 660S still costs 411 € or more (which is overpriced - at least there seems to be a consensus on that, lol). But even if the 660S costed 300 €, and even if it's a "better" headphone overall, I would still lean towards the HD600, because it's a "better" headphone for the two particular things I'm looking for here.
Once again, thanks everybody for being so helpful. I love this place and I hope I'll be able to contribute more in the future.