I've been lurking Head-fi for quite a while now and recently bought a pair of Ultrasone Signature DJs for portable use. Now i'm searching for a portable amp/dac to further improve my current setup (xperia z1>firestone fireye mini+>sigdj). To my knowledge, SigDjs don't really need a heavy duty amp to driven sufficiently, so really what I'm looking for is an amp with good synergy with the headphones (Maybe a slighly mid forward amp to to help SigDj's recessed low mids?). The size/portablity and durability of the amp are also important since it's going to be used 90% on the go. Additionally, the amp(/dac) should preferably be battery powered and have low enough output impendace for 32 ohm phones.
I've been looking at a few options: (in no particular order)
Headstage Arrow 4g + Stoner UD110v2 (durability and availability: ?)
Leckerton Uha-6mkii or Uha4+UD110v2
Meier-audio pcstep (dac quality?) or Meier-audio 2step+UD110v2
ifi nano series
or any other amp + dac combo in 250€ price range. (Feel free to suggest anything )
Thanks in advance for your help!