We should be aware of the rest of the components in your system before making suggestions, this would be helpful. I feel that the wrong cables, whether silver or copper can make things much worse. Some copper cables sound brighter than others and the same principal applies to silver. Silver cables as a rule will reveal and resolve almost all of the good and bad in a system; this does not mean you should rule out the possibilty of using silver but it does mean you should research, listen and decide which cables sound the best within your budget, in your system.
Judging soley upon your amplifier and present speakers, I'd like to suggest Dunlavy SC4A's or Proac Response 2.5.
Chris