I would only consider upgrading the power supply in Node as suggested by @pedroeb if you plan on keeping the Node otherwise you’re better off moving to better streamer like Aurender N200 or N10 once you have upgraded the DAC.
I upgraded the power on my Node for $214 -- that includes the board from PD Creative plus an excellent deal on an Acopian LPS from eBay.
I see the Aurender N200 new out there for around $6000 and I'm seeing the N10 out there, used, around $4000 and up.
If your Node was $600 to start, you're only at about, say, $850 with the power supply upgrade. That's still a far, far way from $4000 and $6000.