The cable you need to use is HDMI. On the one Samsung 8000 series LED TV I found online, it had 4 HDMI inputs. That should be enough for what you want to accomplish. The Blu Ray deserves HDMI the most, but all other sources stand to benefit from HDMI as well. Here is a site that has quality HDMI cables, but not monstrous prices. I find them to be a great middle ground for the best value:

http://www.comprehensiveinc.com/Comprehensive-Video-Cables-HDMI-Cables-HR-Pro-28-AWG-HDMI-1-3a-Cat-2-Cables-11529.html