I'm happy for you for the success of your sale.
If let me summarize again your appreciation of your three headphones High-End , have can say:
The most comfortable is the HD-800 (the least being the Abyss)
The most beautiful is the SR-009 (the least being the Abyss)
The best, you don't know yet, at the stage of your preliminary comparative listens, except that now it would seem, for you, that the Abyss is the best for the quality of the bass, and that the HD800 and SR-009 (ex aequo?) are the best for the quality of the mid and the treble.
I do not know the HD800 (I have only a HD-600), but your choice seems pretty logical to me.
Good listens with your headphones. There are more than for you to tweak your system, starting with an amplifier that goes well with your selection. You will tell us news.