I have LGLW6500 and am very happy with it. You can read more about it in my thread
http://www.hifivision.com/television/17500-hunt-starts-3d-tv-plasma-led.html
I was always a Samsung fan but watching 3D movie with Active shutter glasses is a pain. So many issues. Glasses are too heavy and give headache. Crosstalk issues, IR sync issues, charge the glasses before watching... Overall your 3D experience will be bad. I would recommend LW6500.
The 2D video quality is really good in this TV. Obviously if the settings are on standard, it will be too bright since its LED but I prefer the Expert settings and believe me, the picture quality is good with natural colors.
From where you got this info that LW6500 has HDMI 1.3???? HDMI1.4a has 3 main features which HDMI 1.3 doesn't have. ARC, Ethernet and 3D. Bandwidth is same for both (10.2Gb/s).
My TV supports ARC and have tested it. It is even written on the HDMI port. If it doesn't have HDMI1.4a then this TV can never support Frame Sequential 3D format and again I have tested it.. I have connected the TV with my HTPC also and TMT5 detects it has HDMI1.4a 3D TV.
Don't get confused that it doesn't have HDMI1.4a