I have standard (free) red and white interconnects running between my pre/pro and multichannel power amp and they work a treat. I would recommend trying these and buying a few blu rays with any cash you would otherwise have spent 🙂
I tried some free ones from my Sonos ZP90 to my amp and they were dreadful, even swapping in a cheap set for Richer Sounds (they're white, that's all I can remember about them), improved things dramatically, so that's what I'd suggest, I think they were about 10 pounds per pair (I bought three cos the amp's only 5.1).