Hello,
The week link is your preamp. If you want separates start with the preamp like a Rogue RP-1. I would keep it simple since the amp is just ok. Rogue Sphinx v3. If you don’t care about the phono preamp get a used V2 and then work on a great DAC.
Just so you know the BlueSound is a great app. Sometimes when you go to a new DAC and streamer you lose that great app.
How about a simple NAD 316 Bee. With your BlueSound Node 2i this will do great. Then save up for a killer DAC.