I'll qualify this specifically (by order of preference):

• must have the highest diagonal measurement, widescreen or "normal" aspect ratio doesn't matter here, just the diagonal.
• must have the highest resolution available, which means 72 inches of 1280x1024 won't cut it.
• must not have a TV tuner built into it, I'm not looking for a TV set, this is a monitor!
• must be available at a retail outlet that caters to the general public, i.e. Best Buy, Sears, Costco (all of these examples are in the U.S., although you can suggest something from whatever chain is in your area/nation/geography). Non-retail or non-physical venues like eBay, or businesses that only cater to other businesses, do not qualify under this requirement. I should be able to walk into this place and purchase it, not just whip up an order online. If you are unsure about this requirement, just ask yourself: can I physically see it before I open my wallet and purchase it?