What cords/accessories do I need for new Samsung LCD TV?

I just bought a Samsung 46'' LCD TV, 1080P, 12HZ and am wondering what accessories should I get for the best TV viewing. I already have the digital cable with an HD package, but have been told that there are certain HDMI cords that I should look into. I am not sure what comes with the TV (bought it from Amazon.com, LLC. I also have an XBox 360. Any advice would be greatly appreciated.