240hz for a mid to top end gaming machine is the only way to go. I couldn't believe my eyes when I picked up a Sony 55" HX800 (upgraded from a 46" Samsung from 2008) for $1500 (CompUSA), brought it home, calibrated, and began punching up games. Awed doesn't even begin to describe the feeling.
Going off the benchmark specs, as long as the frame rate stayed above 30fps w/ V-sync enabled, I would not see judder or artifacting what so ever. Most games stayed at or above 60 fps. Oh and this input lag non sense that goes around...maybe if you were competing for money in an FPS would you notice it. Yes its that good without all the bs that people spout. I'm even using wireless inputs.
AMD Phenom 2 Quad + 6850 + 12GB memory.
Games tested: Dragon Age 2, Mass Effect 2, Battlefield Bad Company 2, Resident Evil 5, Star Wars Forced Unleashed II, Splinter Cell Conviction, Lost Planet 2, Bioshock 2, Batman Arkham Asylum, Fallout New Vegas, Dawn of War II Retribution, COD Black Ops, Crysis.
I'm never going back to 60hz.
Now I just need 3-D, Crossfire and 2 more 55's so I can begin to lose my eyesight!