Power Cord suggestion please

The lesser expensive Shunyata power cords (or any other brand) as long as you are sure they will fit into your IEC. 
I definitely heard an improvement in the bass, with my Von Schweikert dB 99 speakers when I upgraded the power cords to the Shunyata Diamond Back power cord. I would think any good 12 gauge professionally made or DIY power cord should do the trick.

It would be a wonderful world if changing a piece of wire improved sound quality! Alas ...

@mlapenta,
You need a Cullen Crossover power cord, which is 12awg.
I have 2 Cullen power cords and ordered a new Crossover II for a new preamp in my system.

I have a crossover. Beautiful workmanship. I was and remain a skeptic, but may hear slight bass increases and better soundstage. Pat is a great guy.