tincanear
Headphoneus Supremus
Budget is around 500 to 600. Aside from sound bar, i will use it together with my upcoming Sennheiser HD800S.
for headphone amp, solid state (Asgard 3 or Jotunheim), all tube (Valhalla), or tube hybrid (Lyr 3) are all good choices to work with the HD800S, which are 300 ohm HP's with good sensitivity. choice may be driven by your music genre preference(s)