Highlander,

here is what I can suggest:

1. The position of the speakers is essential because they interact with the room. Usually David Wilson`s set-up method works a treat (http://www.tnt-audio.com/casse/waspe.html). It might need a bit of practicing, but hey, it`s free. People often are surprised by the difference 5mm here or there can make.
2. Make sure your speakers are leveled perfectly by using a spirit level.
3. Make sure that all power cords are plugged in the same distribution block or power conditioner.
4. My personal (!) opinion is that the Nordost Thor does make a difference. And it`s by no means insignificant - sound-wise and picture-wise. It is not cheap but one of the cheapest power conditioners that really work. Being wired with Valhalla internally the Thor should be connected by a Nordost cable to the wall outlet. Due to their micro monofilament technology Nordost power cords work best if you have a complete Nordost loom. For me the Nordost stuff works very well (and I`ve tinkered quite a bit with power cords). If you`re looking for more warmth you should try the Brahma.
5. You can experiment with feet such as Harmonix (again, on the pricey side), finite elemente or Pulsar Points. Some of you Hitchhikers might not like this, but just like power cords they do make a difference.
6. The more thought and dedication you put into the system the better it`ll sound.
7. Keep an open mind and try before you buy!