This is for the believers, I know you're out there. What mains cables do you have and what difference does it make?
Let's not discuss if or how it is technically feasible that power leads and mains conditioning can change the "sound" of hifi, especially as this is already hotly debated in another thread.
Okay, to kick off...
* Nordost Vishnu: energetic, deep and well-defined bass, brings out tons of detail, however it is a bit bright, and generally thin-sounding.
* Clearer Audio Silver-line (Wattgate 350i & furutech): rich sounding, very detailed, fantastic soundstage and imaging, excellent midrange, emphasises upper mids and bass, bass is not tight as with Nordost though.
* Van der Hul Mainsstream BS: amazing wide midrange, slightly rolled-off treble, fat bass, however not as detailed as the above two and the biggest weakness is that the bass is too loose.
* Russ Andrews Reference Powerkord: very neutral, but ultimately not as musical or detailed as the above
In my main system, i currently use two clearer audio power leads but nordost for the power amp which nicely tightens up the bass - this works better than the other way round.