The IV.V has ribbon internal wiring (both for high conductivity and minimal bearing interference) and was designed specifically for MC cartridges -- especially of the low output variety (although certainly not exclusively.)
Very high end Koetsu, Transfiguration, ZYX, and van den Hul would all be good choices. And don't forget great tonearm cables. The vdH cable that comes with the arm is crap.
Very high end Koetsu, Transfiguration, ZYX, and van den Hul would all be good choices. And don't forget great tonearm cables. The vdH cable that comes with the arm is crap.