I agree with the pre-amp recommendations but I would also recommend considering the RGPC 400. At a considerably lower price you can buy them one at a time and see what you need to fix your power problems. I personally don't care for the Monster products (series filtration vs parallel with the RGPC). I saw a significant improvement with the RGPC products. My amps seemed much more dynamic and the bass was tighter. Of course I live in a townhouse with only a single branch circuit for my system, your situation may not be a limiting as mine.
Good Luck,
John
Good Luck,
John