I'm surprised that no one mentioned the cost factor as well. IC's are always more expensive (especially long ones) than speaker cable/wire.
I didn't mention it because I felt it isn't necessary to spend a lot of money on subwoofer signal cables.
Ram Electronics Belden 1694A: $21.95 for 17ft.
Blue Jeans LC-1: $31.50 for 16ft.
Blue Jeans 1505F: $33.50 for 15ft.
Monoprice Premium: $5.13 for 15ft.
But nodiak has decided on short ICs and long speaker cable, so it's a moot point for him, but for others who decide to go the other way (or split the difference) there are affordable alternatives for subwoofer use.
Steve