Afaik they all use LG panels the only difference is the software processing? I know it'd be easy to say the 9600 most likely has the best 3D effect being the most recent product release (and the 2.5k price tag) but are there very noticeable changes between the different passive 3d tvs notably the $1k+ range?
edit- the most recent review based on improvements they've made to cinema 3d is from May 2011 and that is when they released a firmware to enable 1080i to each eye.
Before the Cinema 3D technology worked like this: During a time period of 1/200 seconds the TV showed 2 frames; 540 lines for the left eye and 540 lines for the right eye.
The new algorithm shows 4 frames instead of 2 during the 1/200 second time frame. It shows 1080i for the left eye and 1080i for the right eye.