i bought my cable from a guy who makes them in holland. it has the eqdir module and goes straight to a 5 meter usb cable. no soldering or shopping around and ready to go. it has been terrific. and it only cost about $60. ( this would depend on the exchange rate with the euro though), and a very helpful and friendly person. i highly recommend this one. link below
http://www.astronics.nl/astronics/index.html