The X3 is great but the 390 has a better DAC and has a streamer module so you don't need to buy a separate streamer
+1 on BAT hybrid integrated can be found used for $5K
CODA CSIB is a US-made SS integrated, very smooth and pure sound, and can be found used for $4K
BTW the Gold Note is decent but for that money you can do better, get a Holo Audio Spring 3 and Red streamer combo instead, or Gustard R26 for even less $