+1 for Anticables - I am using two pair of copper speaker cables to bi-wire my speakers. The SQ improves with every upgrade that I make to my system. They are NOT a limiting the SQ in any meaningful way: a great endorsement for such inexpensive products. I also own six of their Level 3 power cables. If you go that direction, remember to play them for a while before doing a critical evaluation.
-1 for AudioEnvy - before the Anticables, I used speaker cables and power cables from Captain (bought all-at-once at a hifi show). After the break-in, I found them remarkedly unbalanced and 'thin' sounding (hope that make sense). When I contacted him a few weeks after the purchase, he offered to sell me his newest cables - at full price (no exchange, etc.)! It made me wonder if he had the new cables ready to sell when I bought mine and that he was cleaning out old inventory.