America is moving towards the next generation TV: high definition television (HDTV). Since I am also planning on getting a big screen TV, it seems the following should be considered:
LCD vs. Plasma (other technologies are not so desirable)
There are some web commentaries (including this one) that seems to provide some insights on HDTV. As for screen size, the bigger the better, as long as the price is right. There are also a lot of debate on LCD vs. plasma TVs. So far, it seems that LCD is popular for 32" or smaller TVs, whereas plasma has much lower pricing over competitive LCD for 42" or larger TVs.
Finally: never buy anything unless you really need it. Technology products depreciate very quickly.