Upgrade recommendation. Richard Gray or Mcintosh.

Preamp - but consider the C2200 over the C42. Skip

You will be impressed with the 42.Do you have the 352 plugged directly into the wall?

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

Go with a better preamp. The Gray may be an improvement, but not like what a good preamp will give you in terms of music.

Upgrading the conditioner won't make the Onkyo ne more musical.

If you can afford the C2200 get it over the C42. I own both. The power upgrade needs to be next with the Exact power combo over the Richard Gray. It will really bring things together.