Hi,
I can't make a recommendation but some things you will need to check are that the speakers and DAC will work with USB audio input from a Linux based computer , which is what the BB1 is under the hood.
Ideally you should confirm that they work with a BB1 but that might be difficult up front.
There are speakers that are advertised /known to work, with Windows based PCs using USB audio input.
e.g. AudioEngine make several
John