you should wait
Out of the list you mentioned, I would say the 47 LW6500 is the best model. Even though the LW9800 is the flagship models, there have been too many complaints with its performance vs price disputes especially considering the number of zones its full array local dimming has. 47 inches is a good choice since I believe its the sweet spot in terms of size for the passive 3D TV line ups in 2011.
The LM series you mentioned aren't released yet however I would recommend waiting. The LM7600 is going to be released in March. It will also have the new google smart TV platform on android OS that will be much faster.
http://www.avsforum.com/avs-vb/showthread.php?t=1395050 heres a list with all the release dates for the LG 2012 TVs except for the LG OLED TV.