I have gone from some very pricey cables (Kimber, Nordost, Cardas) to Paul Speltz anticables and am truly amazed at how good they sound. Before moving to anything more expensive, I urge you to try the anticables, especially since they have a 30 day trial period. It just may end your search for a cable that delivers that missing something.
Speaker Cables
I have used MIT Terminstor 2 biwire and Monster Z series biwire for my Apogee Stages, but they seem to be lacking something. I am using a Carver 500 T amp. What do you suggest, Thank you.