Sony might have beaten LG to the punch in the 84-inch 4K TV wars with its XBR-84X900 pre-orders, but you've got to be on the field to win -- and the first to show up for battle is LG's 84LM9600, which is officially on sale and in stores as of today. Anyone who can find a retailer carrying the Ultra High-Definition LCD can drop $19,999 to get what will undoubtedly be the centerpiece of the room, even if there's hardly any content to fully exploit thos
