My main source will be an ipod nano, the sound quality of which I think is excellent (far better than my Iriver H10 that failed after 3 months...) but sadly no line out, MP3 most of which at around 192kbs and a pair of Sennheiser PX100's.
The nano is great at lower/mid volumes, but if I crank it up passed 90% a fair amount hiss is evident and it lacks a bit of 'ooomph'
I'm truly awful at soldering, due to shaky hands and no patience.