To classicrockfan:
You are 100% correct.
As long as a power cord is thick enough to handle high current, any such a cord is good. The cheaper, the better. Power code can not affect audio sound quality (maybe 1 - 2%?).
I have Vienna Mahler speakers. My pre, power amp is very old and relatively cheap. Onkyo pre, Yamaha 200W power. Cheap but thick power cords, $20 interconnect everywhere. The sound? Awesome!!!
Please, do not waste your money, just get higher end speakers as you can afford.