This question is asked constantly so if you scan the first 4-5 pages of this forum you will find information. You can also do a search under "46" and find other threads. You could actually go to the store and see these sets real time then come back with specific questions. You can also post this in the "what LCD should I buy" thread at the top of the first page
http://www.avsforum.com/avs-vb/showthread.php?t=1230050
http://www.avsforum.com/avs-vb/showthread.php?t=1230050