Skylab
Reviewerus Prolificus
There is no such thing as a "USB > mini cable" - what you need is a USB DAC. There are a lot of portable amps that include USB DAC's (including from ibasso). So you go USB from the PC to the USB input on the DAC/Amp. There are also stand-alone USB DACs - for use in my office (non-portable), I use one of these (a Music Hall 25.2). And yes, I just use iTunes as the player.