power cables? What can I expect?

I have a pair of Martin logan speakers, and a Audio Refinement amp, they have only the original cables that came with them, I do however have all nordost interconnects and speaker wire, I am only able to spend $50, per cord at this time since I have a new daughter ( and new bills ) I know I can't afford nordost what about monster or just something else that would be good? Thanks for any infor, Nick