Power strip question

Ok, so this may seem off the wall.  I am a professional guitar player and my best friend and roommate is a hardcore audiophile.  Long story short I used one of his power cords to plug my Marshall into the power and noticed an immediate change in the sound of the amp.  To my somewhat horror I realized that I am going to have to do a serious upgrade in power cords, patch cord connectors, etc which I've done largely by using Mogami cords for my effects and guitar which are a substantial upgrade that will do for now.  I purchased my roommates used power cords when he upgraded his for his sound system.  

I need to get a power strip or multi-plug station that plugs into a traditional electrical outlet.  While gigging I have to use what electrical is available.  Since I am an extreme neophyte I don't even know where to begin so any advice would be greatly appreciated

Thanks!
R