Reasonable Cable Suggestions $300

IMO biwires make small to no difference.

PS Audio and have them cryo'd. I am very happy with mine.

Analysis Plus cables; fantastic yet reasonably priced. And, you can usually find them used on AudioGon.
And, yes, bi-wiring makes a difference.

http://www.analysis-plus.com/

Also, check out reviews in Stereo Times:

http://www.stereotimes.com/cables050800.shtm

Try out Analysis plus oval 9 speaker cables. I use them in my system which is Bel Canto and Martin Logan. The cables have a very neutral sound strong bass, smooth mids, and soft highs. They run about $350.00 with T-1 spades for a eight foot pair. www. Analysis-plus.com.

Russb