Power Cord Recommendations

Are you asking to buy ONE longer cord and cut it up into several for the several items?
If so, then for an inexpensive cord, a Shunyata Venom 3.
The wires are not complicated inside of it.
I would NOT recommend a Pangea 9 gauge at all, as it is thick, complicated, and the other diameter would preclude nearly any connectors available.
Though the 14SE could be done, though the conductors are complicated multi wires in the sheath.

I use Acrolink with Furutech F1 connectors or Oyeida...very happy with the results.

What parameters are you looking for in a cord upgrade.The only thing you mention is flexibility.Just curious.

Vh Audio Flavor cords........DIY or Factory assembled...

I've used both Kaplan Cables and Triode Wire Labs on my McCormack amp. The Kaplan is a little warmer sounding, but could be a bit much depending on the tubes in your Modwright. The TWL cable is clean, transparent and works well if you are using warmer sounding tubes in your preamp.

Both are excellent cables, depending on the sound you are after.