If you don’t already have a good solid state amp, I would go with the CTH. I have a DarkVoice and love it. But I don’t think it’s ideal as a first and only amp. Like an exotic car shouldn’t be your only vehicle.
As far DAC it depends on how good the output fro your computer is. That said, if you are starting to get into high end audio picking up a DAC is a good idea In the long run.