Yeah it does have a headphone out. And the HD558 comes with an adapter, so no problem there.
I will wait for the HD558 to arrive and my economy to get a little better than I can start the research for the best Headphone Amp for my budget thinking about the present and the future. But the search for a DAC is stupid, the Titanium HD does an awesome job already! Good thing I have you guys to give me some valuable info