Thanks for the suggestions. Being impatient, I went to the neighbohood RadioShack yesterday to see if they had other products than their basic shielded cable I had been using and I picked up an Auvio brand 3.5mm to RCA cable for $17.99. It kills the original RadioShack branded product.
I will check out the others suggested here as well. I am familiar with Signal Cable, and own some Blue Jeans products and am generally impressed with the quality of construction - haven't done serious A/B testing with mainstream audio cables however. Not very familiar with MAC products, but have read other positive comments on Agon - thanks for that suggestion.