Have a read of Tyll's review of the Elear on Innerfidelity. It seems he prefers it over the HD800S but having auditioned the Elear quite closely myself, I find it a matter of taste. The qualities that led people to own the Senn isn't what they seek in the Elear. They are quite different cans, and Tyll did describe each strengths quite accurately.
As for the SS amp, you're gonna have a lot of opinions about what's considered best. Again down to sonic tastes. No doubt the HDVA is made with their flagship cans in mind and there will be great synergy. You might want to wait and check out their coming HDV820. Should be an improvement over the current offering.