Belden 10 gauge cable sold by Blue Jeans @ about $1 per ft. Best bang for the buck AFAIK. Only down side is that it is not shielded but for most that is not an issue I think.
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If you really want to do what you describe you should think about separates. Place only your power amp between the speakers and run balanced interconnects between the amp and pre.
I realize that this would change your system completely, but given the cost of 32ft of high priced cables and the fact that impedance and capacitance is is directly related to length, so the end result of even the best cables will be a sonic compromise at best, you will be better off with the change.
Sell your integrated and you speaker cables and buy a pre amp, mono block power amps, with balanced in/outs, balanced interconnect (Mogami or similar, since balanced interconnects should have little impact on the sound) and finally 2x3 ft of Canare cable proposed by Peter above. The total cost should not be much more than buying long speaker cables and you should get a net improvement in sound.