XS are definitely one that needs a proper amp and dac. As to what to pick, that depends on budget and preference. A Schiit Magni and Modi stack would be a good starting point if you just want something simple.

I definitely wouldn't describe XS as laid back or lacking soundstage, so I think you're on the right track.

Right now I'm using a Teac UD501 and a Magni Heretic and getting pretty great results. I'm actually pleasantly surprised at how good it sounds considering I bought the Heretic as a temporary solution; it has tons of clean detail and good control over the bass.

Planning on going way overkill and switching to a Purifi speaker amp for my setup since I'm driving Stax as well, although I can't in good faith recommend going that route since it's an easy way to end up with blown headphones :P