this is exactly why you should research before buying. it's not LED VS Plasma, it's a particular defect with this size within this model. LCD technology alone does not make the hair go green. please do some research.
the inherent flaw is within the panel used, and its vertical refresh rate that is assigned to the panel. someone in a previous post a while back had the guts to try a different panel ID and fixed it, another person was able to update the T-con board firmware and got rid of it as well. which essentially tells the TV to use a different panel refresh rate that's meant for a higher end model. why Samsung hasn't publicly admit this flaw and address it baffles me and it's not right the fact that it's fixable with a firmware. but for you to outright say stay away from LED is just plain naive.