I recently purchased 55" LED TV, did tons of research.
As far as CNET concerned, I feel they are seriously bias towards Pioneer Plasma TVs.
When it comes to Costco you cannot go too bad, less selections maybe...

I personally stayed from Sharp, and Sony LCD/LED panels.
1. I wasn't impressed picture qualities I saw at Bestbuy, 2. They are shutting down factories in Japan after they failed to sell them to Taiwanese. Go figure.

My pal who's a Video Processing Researcher at "D" Lab who also worked for LG told me
as far as LCD concerns LG makes the best panels, but Samsung is better at Signal processing. You should know most of Apple "Rat"na display are made by them...
3D TV is always brighter then non 3D...
You won't know the difference between 120Hz and 240, really... LCD won't even refresh that fast...

65" I would get this
Amazon.com: LG 65LM6200 65-Inch Cinema 3D 1080p 120Hz LED-LCD HDTV with Smart TV and Six Pairs of 3D Glasses: Electronics

If you are in the higher end market. I don't know much.
Good luck