I just have problems paying $500 for 6ft. piece of wire.Get over it, or you'll *never* hear the potential in your Ushers.
Stop thinking of them as "wire." They are passive components, and like anything else, are subject to the same rules of design, quality control, quality of materials, copper purity, signal transfer efficiency, engineering, and ultimately, point of diminishing returns.
I never understood the mentality of buying top quality gear and then thinking that the cables that perform the signal transfer from one component to another are exempt from those basic laws of quality vs. economics.
The very least you should have for your system is Kimber Hero interconnects and 8TC or 12TC speaker cable, or an equivalent from AudioQuest, Cardas, or Analysis Plus. Of course there are many many other cable makers out there, but this would be a good start.
Also, think about adding a high quality outboard DAC to your digital front end. The Onkyo is a highly regarded CD player for the money (and I have their companion A-9555 integrated amp, which is great for the money). Still, if you spent your $2-3K on $250-300/pr interconnects, a $500-600 pair of biwire speaker cables, and a Benchmark DAC-1, Lavry A10, or PS Audio Digital Link III or their new PerfectWave DAC, you'd hear the music as you'd never heard it before. Not more boom and sizzle, but rather loads more of everything in between, where most of the music lives.