upgrade question regarding DAC and streamer

I want to improve my system's imaging after having carefully placed my speakers and done some room treatment to reduce reflections.

My system includes a McIntosh MA8950 integrated amplifier, Sonus faber Olympica Nova III speakers, a Silent Angel Bonn 8 network switch and its LPU, and an Innuos Zen Mini Mark III with its LPU. I use the Mini with its Sense app to stream Qobuz to the McIntosh's DA2 DAC.

I am considering a DAC+streamer such as the MSB Discrete (with render/streamer add-on, and its separate single LPU) and the dCS Lina (with built-in power supply). My budget is about 15K.

In the future, I will get a separate preamp and amp, perhaps using the MA8950 as the preamp for a while.

The dealer with whom I have a great relationship carries MSB, dCS, and Innuos (their Stream3 may also be a good option when it comes out). Of course, I will listen to the DAC+streamer options with the same/similar integrated amp and speakers at the dealer's.

For the purpose of improving imaging with my system/room/good speaker placement, does upgrading the DAC and streamer make sense, or should I upgrade to separates first? Or something else?