Low ESR decoupling capacitors - how to design against ''ringing''
Define "low". Because there is low like an X7R capacitor which generally causes no problems, and C0G/NP0 which his very low and should not be used for decoupling for this reason (also expensive and overkill).


  When choosing decoupling capacitors its frequently mentioned that the lower ESR has a greater tendency to cause ringing so its advised to use medium/high ESR capacitors.


You never mentioned whether the context in which you saw this. I have only ever seen it mentioned for ceramic caps which are used for high frequency decoupling. I haven't read about it being a problem and I think it's because they are used for lower frequencies. 

Spend less money and use a cheaper polymer cap that isn't so low in ESR. But if you insist on spending X amount of money and want polymer longevity but your ESR is too low, then going to a higher voltage rating tends to increase ESR (as well as probably increasing longevity).