PQ won't be the same since A650 should be better than A550 because it's a glossy screen instead of matte, higher contrast ratio. I strongly recommend you go to your local electronic stores like BestBuy and/or Circuit City and check out both models. See which one you like best and get that model. Sometimes, A650 reflects more lights in a store because of all those lights so keep that in mind when you think A650 is like a mirror.
The 650 series has amp which I personally believe is the greatest innovation in television since the invention of color. Some people love it and some people hate it. You need to check it out before deciding between the 650 and 550. Otherwise you might regret your decision.
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