We've supported balanced line operation longer than anyone else in high end audio- if you want a good quality inexpensive interconnect that works great with the ATC, Mogami Neglex '4-wire' cable is a great way to go.
Balanced line operation was devised to reduce or eliminate interconnect cable problems, meaning that if your balanced line system is set up properly, short and expensive cables will not be required, even for reference level work. In this case what this also means is that the preamp should have the ability to drive long interconnects (over 50 feet)- check with the manufacturer to see if that is the case! If not, you will also have to spend real cash on the cable too, so this quality in the preamp is very important!