The 4665f has a glossier ( if thats a word) screen resulting in slightly brighter colors and deeper black level while the a550 has a faster panel response time (less motion blur), newer generation panel, higher dynamic contrast, and a much better remote. If I were buying one of these two I would go with the a550. Based on what I have seen with my own eyes the difference between the two is hard to discern whether you are watching regular HD or a Blu-ray. Don't doubt your decision. In response to another question posed above, the reason the a550 is cheaper while being a slightly better tv (in my opinion) is because manufacturing costs get cheaper as well as there is more and more competition from "bargain basement" brands such as Vizio, Polaroid or Olevia. Price is not always the sign of a good product as is seen with Bose and Sony. And no you shouldn't call Best Buy for help you should of course call Circuit City.