I also have Time Warner and am pretty familiar with their cable boxes. Maybe your area is different but none of my digital boxes or HD boxes have had a digital optical out. They are always digital coax. Just wanted you to make sure before you buy the cables you need.

Panasonic TC-P50G15, DMP-BD60
Yamaha RX-V1400
Axiom M60's,VP150,QS8's
Hsu VTF2