When should I upgrade my HDTV?

First I would wait for Apple displays unless you really need a new TV.

Let's say you've had your HDTV for a few years now. Let's say you can't stop reading new TV reviews. Let's say you find excuses to stop at Best Buy to stare at the wall.
OK, you want a new TV. No problem. But do you need a new TV? Are the current models really that much better than what you have?
Let's take a look.
http://reviews.cnet.com/8301-33199_7-57414446-221/when-should-i-upgrade-my-hdtv/?part=rss&subj=news&tag=title