Do I need a power cable - if so what brand?


I am a newbie to high end audio and need some help in optimizing my setup. I have Yamaha V1800 bi-amped to B&W 683 and bi-wired to B&W center. Yamaha amp and other audio componets are connected via Monster HTS 3600 power center. I am using Xindak FS-1 for fronts and Monster Z2 ref for center. 95% of my usage is for music.

Based on the above setup, should I replace:
1. Wall to Monster 3600 power cable?.
2. Monster 3600 to Yamaha receiver?.

Which of the above will give better sound performance (if at all) and if it does, what power cable should I consider?.
satiger
I would consider before buying anything else to consider one or two new dedicated ac lines..Then try removing Line conditioner..Sometimes just with new lines and bypassing a conditioner can give you much more than a new power cord..Probably a bit cheaper too........
I have never met a line conditioner that didn't make matters worse. Power cords on the other hand, if carefully chosen can do great things. I have made my own power cords from Oyaide plugs and Accrotech cable. Go to VHAudio.com and check it out if interested. Regarding your line conditioner...remove it and listen again, and hear if you like it with or without. Sure it changes the sound, but does it bug it as well?
Thank you guys for the suggestion. Appreciate it. I will remove power conditioner and listen to it on this week end. However, one thing I noticed when I introduced power center into this setup was that the improvement in sound stage.

Based on my testing in this weekend, three possibilities could happen. With direct connection, I could hear better sound or remains the same or worse. If it remains the same or worse, I will prefer to keep the power conditioner.

So, my question is will I see an improvement in using power cable with direct connection?. Looks like I may not hear any improvement in using power cable along with power conditioner - is it true statement?.