I can’t speak to the Lumin DACs, but their iOS app is outstanding. After trying out several DNLA control points for iOS along with Sonos, the Lumin app easily takes 1st prize (I use it to control a Rasoberry Pi based server running Volumio, which is compatible with the LUMIN app).
Incidentally, Hegel makes some wonderful DACs as well (the HD25 is at your price point)
Incidentally, Hegel makes some wonderful DACs as well (the HD25 is at your price point)