My advice: Don't waste too much on cables, especially the SPDIF "coax" cables. The ones and zeros either get there, or they don't, and you'll know without a doubt if they're not getting there. I have dozens of cheap RCA stereo patch cords in my junk drawers, so I just pulled a few of them apart to hook up my DVD player, CD player, and computer to the receiver through SPDIF coax.
For my speakers, I got 100 feet of 12 ga. copper at Home Depot for about $16. It just happened to be packaged for low voltage yard lighting, but the EE in my blood tells me that the electrons can't, won't, and don't care.
For the best possible results, you'll want some good "video" cables, because they're sheilded and they're engineered to have the proper resistance for video signals, but for everything else, D-D-D-Don't Believe The Hype! (Nor the comissioned salesperson, nor the poor, poor sap at Best Buy, who works not for commision, but simply to NOT get yelled at for poor sales numbers of high-profit items.)