Mine consists of 4 parts: my iPod touch 2G, FitEar Private 333, Twisted Cables line out and the D4 "Mamba" portable amplifier. Does it sound good? It is better than Ezra. But, even ditching the amp, cable and nice earphones, I get by with a lot of good cheapos.
I prefer this because even at very low volumes, I get pristine sound quality and nothing on the bus or train barges into my listening!
Tell me all the parts in yours and why you chose them.