Power Cord Advice

It all depends on how much you want to spend?
If the price is of no concern, take a look at this ad on Audiogon for a CH Acoustic X20 power cord: http://app.audiogon.com/listings/ac-cables-ch-acoustic-x20-power-cable-1-8m-15a-iec-2014-10-28-power-61820-champaign-il
The HiDiamond P4 power cord is also very good, but also pricy.
If you want a power cord without an extremely high cost that sounds really good take a look at the power cords at: http://triodewirelabs.com/index.html
I own and use all three. I’m very happy with them all.
I can also make suggestions for power cords under the price range of $500 if asked.

I too am a fan of HIDiamond and Triode Wire Labs.

Don't know your budget/system context, but here goes :
PS Audio P10 > PS Audio AC12 (I'm running this, cheap ~ excellent result).
Esoteric K03X > Esoteric Acrolink Mexcel 7N-9500 (a friend currently using w/K01X, superb synergy).
*Their safe/natural partners

If you decide to go all-out and like presentations that tip slightly on the weighty, natural/life-like, organic side of things, I'd do :
P10 > StageIII Zyklop/Kraken.
K03X > Siltech Ruby DC/Nordost Odin/ Mexcel 7N-9500 (fine tune to suit best your taste/preference).

If you are going to drop really big dollars take a look at the High Fidelity Power Cables also. http://www.highfidelitycables.com/

HiDiamond D4 will do the work. Superb power cable! We have many greatful customers.