I currently have a Magni/Modi with a pair of Ath-A900s as my work listening system. Im looking for a bit of an upgrade. I work in an office with about 5 other people so im looking towards closed phones. Im also interested in building some DIY tube amps. After looking around at a billion articles im leaning towards the following set up:
 
Mad Dogs with alpha pads
Millet MiniMAX amp
Schiit Bifrost Dac
 
Would this combo work well together, or should I go for a Project Ember, or Schiit Lyr as the amp to give the mad dogs some more power?

What sources are you plugging the Modi into?

Just my compter, running Foobar2000 in WASAPI event mode. I would like to get a new dac like the bifrost that has some additional connections for a cd transport.