spend on the streamer or on the DAC ?

Have you checked to see if you can get a DAC module for the 340i? There is the Simaudio streamer DAC 280d at least you could use the same remote.
https://simaudio.com/en/product/280d-streaming-dac/

I saw the coolest product not sold in the states but in the UK you might be able to. I never heard of it before. Advance Paris. At Kronosav.com

Get the best dac you can afford that has an Ethernet port and then get Roon to run on a server that is located outside of your audio room. Forget about the flawed usb connection, then you don’t need a computer in your room. All streamers are computers and some try to justify their expense on getting usb to work.
If you don’t want to use Ethernet, then use i2s for your dac connection. Most dacs don’t have these inputs but the better 1’s do

+! for this:

rbstehno1,175 posts
Get the best dac you can afford that has an Ethernet port and then get Roon to run on a server that is located outside of your audio room. Forget about the flawed usb connection, then you don’t need a computer in your room. All streamers are computers and some try to justify their expense on getting usb to work.

I have not listened to ethernet vs. usb myself, but I have two local dealerships that I like, and both don't like usb connection.  My own system, Naim 555 server and uniti/core ripper and storage, is ethernet connected. 

The Naim has the server and DAC in one box, but they do go to extremes when it comes to internal isolation.  First, there is a separate power supply box which has multiple power feeds coming from the box to isolate the feed to the various functions in the server/DAC.  The DAC is isolated from the rest of the server by being in a faraday cage; to enter the cage, the digital signal is converted to an optical signal.