help with power cord


hello all, I have a system that consists of BAT Vk 3i, vk 200, meridian 508.20, aerius bi-wire, and transparent interconnects. i was wondering if I need to upgrade power cords. If so, which ones should i consider? My budget is around $50-100 for used pc. thanks.
husaskin
In regard to the HT Pro 11 PC: I have used one on a CAL player and a Bel Canto DAC and it was a major improvement over each units stock cord. I am currently interested in auditioning the Mapleshade PC ($150.00) for the DAC out of curiosity as I really like the digital cable that I recently purchased from them. Other cords that I am considering in the under $200.00 price range (due to positive feedback) are the Silver Audio PC ($190.00) and the JPS Digital PC (used ones are just starting to drop in price). The Master Coupler mentioned above also seems to be very popular. As said before you may want to save up a little more before you buy and get something that will better compliment your gear. I am sure that some of the high ticket PC's are very nice but you can still see a major improvement as well (over the stock cords) in this price range.
PS: I always forget this when discussing PC's. I suspect that they may make more of a noticeable improvment in systems that are running on not so good juice. I live in an apartment in LA the land of "bad juice" and every cord sounds different in my system (even the cheap ones supplied with the equipment). They seem to make less of a difference in a friends system (he lives in a house in a much less populated area) and I do think that it may be the power supply itself.
here is the hierarchy: Synergistic Mast Coup > HT AC 11 Black mamba > Syn,Mast Coup Sonichorizon hurricane,slight advant.> Black mamba,NBS