I have hard time to choose the LG model. Freaking too many model and don't understand that freaking too many key features.

Which 1 is important and which 1 don't need.
So I simplify it to price, size, 3D and picture quality. The rest features is asking your guys sifu help.
Just like normal people thinking, I would like the TV as big as possible with the cheaper price as possible. But I don't no what big screen size problem till you guys decide to get the smaller screen size.
Example I have this few model in trouble decide. Like you post :
47LM7600 is RM4300. Few more hundred add, I can get the size of 55LM6700. Both is 3D. Another is,
55LM7600 price. A few more hundred add, I can get a 70" SHARP LC-70LE735X. But the sharp without 3D. Or probably 60" SHARP LC-60LE835X-3D. This all just few hundred RM different.

If 55" is already in your mind, just go for it bro. If not, you'll might sometimes regret & question why i didnt buy bigger if you opt for 47".
Thats the main reason i bought my 55LM6200. Cuz i'm not that very particular guy in tv visual quality (thus 6200 only). And i'm ok with the less attractive side panel/bezel of 6200. My personal preferrence.