Clear Day Cables. About 1/2 your budget if you get his double shotgun, and there is a 30-day, no questions asked, money back trial period. These are solid silver wrapped around tubing that provides essentially an air dielectric. Well, you can read the rest in the ad here on A'gon.
I have been using a pair of these for a couple of months now so I'm around 200 hours on them. The Clear Days are competing very well with some speaker cables that cost me 4 times what these did. They are neutral sounding and will show you any changes you make upstream.