MIT Power Cables What is the way to go?

I use an all Oracle 2.2. cabling - source - Pre-amp, speakers.
Now I have tested a MIT Shotgun AC 1 powercord on the CDP.
There was an huge increase in clarity, dimensionality and focus.
Should I upgrade to Oracles powercords or stay by the Shotgun?
Will there a further improvement? and what will it be?