Benchmark DAC1 or Ah Reference Tjoeb 4000

I'm thinking in upgrade my digital source ( cheap Sony DVD player). I've read many good reviews about

Benchmark Dac 1
Ah! Noej Tjoeb 4000

but I can't hear them.

My system is : Primaluna Prologue Two and Von Schweikert VR-1.

Which do you think is the best option ?

Thanks!