Keep the Node for now and get a second-hand Qutest. Upgrade the streamer later. I borrowed a friend's Mojo and liked it enough that I found a used Qutest, which I absolutely love. It replaced a massive Doge DAC 7, with a Sabre chip and all-tube output stage. I love the Qutest for it's greater transparancy, speed and lack of coloration, and the desktop connections provide a big upgrade in sound.
My streamer is an Ian Canada kit I assembled, with the PurePi battery-powered base, a Raspberry Pi 4 and the TransportPi Digi II. It's a wonderful match for the Qutest, extremely clean and quiet. The cost is about $300. But that may be more than you're willing to take on. It's also a either "ugly" or "cool" depending on your tastes. ;-) But my main point is to focus on one unit at a time and get the best upgrade you can afford. A used Qutest falls within your budget and if you like your Mojo, you'll love the Qutest.