Okay, let's take the high figure. 679kwh per year x 10c per kwh is $67.90 or $5.66 per month. 209kwh per year is $1.74 per month. Variations in the electric bill based on use of heaters, air conditioners, computers and other appliances will easily mask that level of variation.
Unless you're really poor, in which case you have no business buying a $2,000 TV, this just doesn't look like an exciting issue to me.
D
You'd be surprised (or not) at the number of people on some form of government (i.e. taxpayer) assistance who own luxury items like big screen TVs.
It's hard to get excited about how much electricity the TV is using when I have two central air conditioning units that run practically 24 hours a day in the Houston summer.