If you can stretch your budget, the Lumin U1 Mini would be at the top of my list.
The Marantz also has a DAC and headphone amp that you're paying for. I can't imagine it would be much, if any better than the Bluesound. I had a ND6006 and the software was a nightmare. When the Bluesound devices came out, I felt like I was lucky to have found a buyer for the Marantz. Marantz does a lot of things right, but streaming... not so much.
The Marantz also has a DAC and headphone amp that you're paying for. I can't imagine it would be much, if any better than the Bluesound. I had a ND6006 and the software was a nightmare. When the Bluesound devices came out, I felt like I was lucky to have found a buyer for the Marantz. Marantz does a lot of things right, but streaming... not so much.