[Zoofiee]

Or could just be run out of a DAC without a seperate amp.

 

[Music Alchemist]

  Or could just be run out of a DAC without a seperate amp.

 
There are only a few DACs that can drive headphones directly, without having a separate amp section inside, and they tend to be expensive. What you're thinking about are DAC/amps, which do have a separate amp section and are fairly common.
 
Some DAC/amps are very powerful too, so you'd need to be more specific with what you're asking about in this context. Perhaps narrowing down to a budget for the headphones and DAC/amp combined would get you more helpful answers.
 
I guess my favorite headphone that doesn't *need* an amp would be the Yamaha HPH-MT220. But I always use amps.

 

[CaveManta]

My favorite headphone that doesn't need extreme amplification is the Phillips Fidelio X2. But strangely, my AKG Q701 loves amplification, yet it still sounds nice driven by my old Galaxy S3.

 

[HipHopScribe]

Hifiman Edition S or the Philips Fidelio X2

 

[Medicake]

 My Philips Fidelio X1 sound great even without an amp.

 

[buke9]

HE-400S.

 

[franzdom]

Beyerdynamic T5p 2 

 

[Kerry56]

NAD VISO HP50 does fine without one.

 

[ProtegeManiac]

  Or could just be run out of a DAC without a seperate amp.

 

If you mean a DAC with a headphone amp section built it into it the size of a small stack of gift cards, like the Ibasso D-Zero, there are literally dozens of headphones that benefit well enough from such a DAC over, say, a smartphone or tablet.

 

If I had to pick any favorites though then it would have to be the Grado RS-1 and SR325, and Focal Spirit Pro.