Where to put new Dream State Veridical cable

Hi. I'm getting a Veridical Dream Dream State power cable and I am wondering where best to try it in my system. The cable is meant for source components so it's between my preamp, dac, transport or perhaps my Taurus MK2 headphone amp which the cable might work on. Please check out my system and advise.Thank you.
Link to my system on my sig or http://forum.audiogon.com/cgi-bin/fr.pl?vdone&1176770973&read&keyw&zzdream=state