You can see my current setup in my signature. I am thinking of upgrading to push more performance out of my headphones. I am pretty sure I am end game as far as headphones go but want to try to get more out of them. I am thinking of a tube amplifier would be a good choice for the 800S + Auteur and Atticus but I am open to SS recommendations. Also for Dac I am thinking yggydrasil v2 but I am open to anything you recommend. I'd like to spend less than $5000 on the combination (and if you can get me to even a lower budget thats even better, I appreciate something with good value). I should say I did try to the moon NEO430 HAD directly against my burson with the 800S and would say the neo was probably 5-6% better and I didn't want to spend 4k + for it since it gave me a very subtle benefit... perhaps I shouldn't upgrade at all? Thanks for advice.