I'd do separate DAC and streamer; that way you can upgrade either/or unit if you feel the need later. I'll leave the streamer recommendations to others (I use the latest Bluesound Node 130).
Denafrips Pontus II DAC (alone or with a Denafrips Iris DDC which is amazing) and the Holo Audio Spring 3 (Version 2 or higher) or Holo Audio May DAC are great "bang for the buck" DACs.....$2,000 to $3,500