DAC/Amp for HD650 - Advice on e.g. Apogee, Headroom or Stello?

Hi! Advice on DAC/Amps needed?

Here are some options to start with - other suggestions are very welcome

1 Got a Stello combination (Stello DA 100 + HP100, second hand 1200 USD)

2 Apogee mini-dac (second hand 800 USD). 

3 Also I'm considering the HeadRoom Desktop Amp/DAC (New: 800USD + tax = 1000), whih can be upgraded with a power-suppy (another 625...) 

This is for my bedroom listening post. I really prefer a one box solution - but the sonic advantages of combos can weigh up..... I consider the stellos because they are available in the neghbourhood and are aesthetically OK as a duo. 

Anyone had the chance to listen to any of these?

By the way I live in Norway - pricing might be a bit different here - and that why I have to pay taxes on imports..

Thanks :-)

No-one seems to have any opinions to share. Bump.