i really wish there was a good guide to all the different names and numbers i realize its all most impossable as the companys are just dumping so many models (just the samsung 5 series has 15 models) then the 6series 7,8 9 there must be 100 different models most numbers do not mean that much but the 120hz does make a big difference .i learned the old fasioned way i just keep bringing them back, Sams has a 90 day policy and they said they would extend it sometimes up to a year but its a pain in the A-- boxing them back up but worth it in the long run.... what was by far the worst ? the rca but it looked cool till you turned it on that is if it came on