DDC or Better Streamer?

I’m trying to decide which would provide greater reward, adding a DDC or moving up to a better Streamer.  What am I looking for?  Just better everything including bang for the buck.

DDC – I’m a LAIV fan, but the Denafrips Hermes has optical inlet and would allow me to use it with both my OPPO (toslink) and Bluesound (digital coax).

Streamer – Am I better off just cutting to the chase and looking for used $3k Streamer (which would be more than twice the price of the Hermes)?

Will the better $3k Streamer be the better value over the $1.2k DDC?

Thanks for your input.

Room - Essentially 18'x18'x18' (ugh)

Power - Furman Elite 15i

Transport - Oppo UDP-203 with Glass Toslink

Streamer - Bluesound Vault 2i with Ice Age Ulitmate C7 Power Cable, Nordost Silver Shadow Digital Coax

DAC - LAIV Harmony with Shunyata V10 NR Power Cable, Kimber Cable Silver Streak RCAs

Amp - Music Fidelity M6si with Shunyata Black Mamba HC CX C15 

Speaker Cables - Cardas Quadlink 5-C

Speakers - Martin Logan Motion 60XT

Subwoofers - Dual SVS SB-2000 with Blue Jeans LC-1 Cables