I was set on buying the Sony Bravia KDL-52XBR5, really liking the picture shown on the in-store XBR4, plus the fixed piano black bezel. The in-store salesman told me he his favorite was the XBR5. Upon confirming my internet order for the XBR5, the salesman tried to upsell me on an XBR6 for cheaper, saying he owns an XBR4 and was looking to trade up based on the upgrades in picture quality. He was going to offer me a discount on the XBR6 compared with the XBR5, seemingly based on availability and sales trends in favor of the XBR6. My question is whether the add'l features and technological advance on the XBR6 worth the aesthetic compromise (IMO, not sure about the bottom mounted speakers look/sound quality)? Any help would be appreciated, thank you.