I just received my first amp. It's Fiio E6. Using it with Sennheiser HD25 1-II's.
The interconnects that come with the device aren't good - the L-shaped one's length is good but the cable is stiff. The cable with straight jacks is too long. I'm not into DIY so I'd rather buy a finished product. Also it should be sub $50. I'm pretty sure that there's no point in getting more expensive interconnect for that amp.
The length should be 10cm/4in max.
Ordering to Europe if that matters ;)