A wolfson in sheep's clothing

Hi ,
I’m looking for a dedicated music device,( maybe sometimes film ) for commuting . in my research I have liked the idea of using either an old iPhone 3G or GS or iPod Touch. Both are really inexpensive and nice quality on the used market I also found the Wolfson Dac used in these ,as described, more attractive to me, than the Cirrus for my music, which is Classical.
One of the things I’d like to know is which of these devices sound the best for music with my B&O M4 headphones there are different Wolfson Dacs ( & serial numbers ) in different iPods and phones. Just to note, I orders an Apple Dongle last night ,on eBay.
I am now using my iPhone 5 SE which is my daly phone and by the way, I really like it. I don’t need to “upgrade” .
Also is there something clearly better than these on the used market in sound quality for a reasonable price?
importantly. I need to be able to download excellent quality files on these devices for listening to music , in {{ Primephonic }} for example .
Thanks

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