I have a Toshiba SD 42HKSA home theatre system. My home theatre system has 2 RCA input jacks and also a 'optical input' port. I am planning to buy a new TV which can connect to my home theatre so that I can enjoy Digital 5.1 speaker surround sound. What ports should I look for on the TV. Is it the 'optical output' port?? Also which TV model should I go for???