this is a bit off topic from the op's request but it does support your thoughts to explore power cables. it is hard to quantify but i would confidently say that with power cable additions alone, i have increased the quality/performance of my system by 30%-40%. i admittedly invested more than you are looking to but it is relative to the overall system investment. i agree with much of what stringreen wrote in that it takes some playing around with different designs to get to a good place. some cables don't sound right on one piece of gear but fit perfect on another. i have 3 different brands of power cords but each seem to be the right fit for the gear they feed, it was a project to get to this point.
it amazes me to read so many posts stating they cannot hear a difference with upgraded cords. it is truly night and day in my system. i do not understand the philosophy of upgrading a component vs adding a power cable. if you like the piece of gear, it makes sense to do all you can to allow it to perform to it's full potential. most manufacturer's expect us to toss the cord that comes with it and attach one designed for audiophile performance.
good luck on your quest...
it amazes me to read so many posts stating they cannot hear a difference with upgraded cords. it is truly night and day in my system. i do not understand the philosophy of upgrading a component vs adding a power cable. if you like the piece of gear, it makes sense to do all you can to allow it to perform to it's full potential. most manufacturer's expect us to toss the cord that comes with it and attach one designed for audiophile performance.
good luck on your quest...