[guiffre]

Hi Everyone,
 
I'm brand new to head-fi, however, have been quickly learning tons from all of your efforts. Especially re: Chinese IEMs (knew NOTHING about those wonders).
 
Anyways, I currently have been listening on the go with an iPhone 6s. I've never owned a separate DAP since the days of the iRiver and iAudio.
 
Just looking for thoughts on whether picking up either the Xduoo X3 or adding a Fiio K1 to the iPhone 6s would be worth the investment.
 
I own a pretty wide variety of headphones, earphones and IEMs now. My current favorites being the Sennheiser HD600s, PSB M4U 1s, Sennheiser HD280s (for tracking),
UiiSii HM7s, Rock Zircons, DZAT DF-10s, KZ-ATEs, Tennmak Pros, Ausdom M05s, Jaybird X2s, Advanced M3s and Koss Portapros.
 
I listen to everything from Jazz and Classical through to Rock, Pop, R&B/Hip-Hop, Electronic, Folk and Singer Songwriter...only genre exclusions would be metal and mass marketed country.
 
With that in mind, how seriously should I be considering the investment in a separate DAP? How dramatic would the quality difference be between the standalone iPhone 6s?
 
Should I consider something like the Fiio K1 or Dragonfly instead?
 
Thanks in advance to anyone who takes the time to respond.
 
Cheers!