I'm really happy with my current setup, the built-in amp the DNA has really helped and made a noticeable difference when pushing high-end IEMs and cans. I've got UE-900 IEMs with Comply foam tips and aftermarket cables and a Fiio E17 amp and FLAC music on a 128gb thumb drive playing though Neutron MP and Noozxoide and it sounds freaking unbelievably awesome.
Phone - Google Nexus 5 Black 32GB
ROM - Mahdi-ROM (12/10 build) with Candy Shop Mods
Kernel - franco.Kernel - r20 from franciscofranco
Recovery - TWRP 188.8.131.52 with Holo theme
Retired Phones - Droid X2, HTC Rezound, HTC Droid DNA