First of all, there is one major difference between the A650 and the A950. Naturally, there are smaller features that we can discuss later, but the big difference is that the LNxxA650 series uses CCFLs (cold cathode floruescent lamps), which is pretty standard for LCD panels. The LNxxA950 units use LED-lit backlighting for LCDs. This is an improvement over the CCFL's in a couple of ways.
The biggest advantage is that you can have local dimming. I could use any number of examples, but unlike CCFL panels, the backlighting can dim, or even turn off on all, or parts of the screen, as necessary. Unlike CCFL's, where the light always stays on, there is more picture flexibility with the 9-Series. This creates an amazing increase of grayscale and color possibilities as well as allowing your darker scenes to be more realistic.
As far as how regular television looks, I need to clarify "regular". If you mean Standard Definition, then no, it will be subject to the same standard-to-high-def-panel picture quality just like every other panel would be. If you mean "regular" as in High Definition transmitted television signals, then it will be impressive.
Since you seem to be pretty big on games (based on the fact that you have two game stations), the Game Mode feature will reduce lag time and delay as well as optimize the audio and video.
I'm not sure how I would rank all three, per se, but I can list out the differences if you'd like.
Hope to help!
Im planning on buying a new tv for my bedroom and I keep researching like i read on Consumer reports that the LN52A650 is recommended but on Cnet, the LN46a950 got a better review, but im also interested in the Ln46A650, so i dont know what to get. Are the LEDs really that helpful for that cost? But i think one of the most important questions is how does regular tv look on them because i watch a lot tv and i Have a PS3 and a Xbox 360 and i use a 65 inch mitsubishi crt with 1080i in my living room and it looks great? How would u rank all three? Sorry for all the questions but thanks for all the help.