any suggestions on what to replace Bluesound Node 2i with


I am doing a major upgrade on my home theater system. I want to upgrade my streamer. I can spend around $4500 if I have to. My dealer played a Lumin T2 and the music, Tidal, sounded amazing. He said I would be okay with the D2 if I wanted to save money
Any one have any experience with the the Lumin's. I am open to other streamers, it does not have to be Lumin. Thanks 
galleybob
When it’s digital it is not hard to make something sound different as desired . So no doubt streamers can sound different for many reasons. Outboard DSP is likely to be able to reproduce similar results.
I think it’s better to say I have never heard bad sound come from a streamer through a good DAC, not that they all sound exactly the same.   
Have you tried a different connection than optical with the Bluesound?   That alone might make a difference. 
I’d be looking for a player better than BluOS. Many are.
+1 on the Ras Pi4 with piCore player.
Toslink isn't necessarily awful. With good glass it's better than coax with a middling cable.
You don't need to spend a lot for a good streamer. The Cambridge Audio Cxn v2 is a great streamer and also uses the Wolfson chips in it's Dac. Sounds great looks great and a bargain at $1099. It's also Roon ready.