For a portable set up, as in on the bus, plane, or setting up at a random table, which of these 2 set ups would be the best for pairing with Beyerdynamic DT-770 Pro 250 Ohm's? I want as neutral as possible, and very high quality, especially in the high mid's and treble. I also want a bass presence, but I'm not a bass head by any means. I listen to classical, rock, electronic, pop, jazz, blues, metal, and pretty much everything else as well.
My source is a iPhone 4 playing ALAC files.
I'll be using a CCK to utilize the DAC's.