Upgrade Speaker Cables or Interconnects

+1 @stereo5 . 

audiozenology, you've been a big help.

I would start at power conditioning first before anything else.
Once your power conditioning is in place move to power cords.
Power is the foundation for everything we build on.

IMO good clean power is like a component upgrade.
It's that important.

Good luck!

Barhi ohr, stereo 5!
Whenever I pass through a little town in Florida called Green Cove Springs,
I always stop in a little hole in the wall called Mush Armenian Kitchen.
Great lamb kababs and vozni for dessert! 

Race Car Driver:  I am having a problem with traction in the corners, what should I do?
Audiophile: Change the engine.

+1 stereo5 !!!

You could try upgrading through Ebay.
Some bargains to be had.
Easy to post, try out, and move on from if they aren't what you are looking for.

Managed to get speaker cables (RRP $1200 for $95) which I still use.