Regarding LED HDTV with the least motion blur for video games -- it's not a good market right now, the plasmas are still a better buy for video games. However...
Samsung is the better buy, but if you already have a high-end (expensive) recent Sony with the "Motionflow XR 960" setting -- there's a new strobe backlight setting in those that does not use interpolation (bad for games). This is the "Motionflow Impulse" setting (strobe backlight without interpolation). It is not as good as LightBoost but it has the massive blur reduction without the interpolation. The input lag is worse than a monitor, but better than interpolation. As long as slight input lag is not important, and you don't mind the annoying 60 Hz flicker. The "Motionflow Impulse" strobe backlight works with console videogames and computers at 60Hz. It does not function in Game Mode, so there's probably a yet additional extra frame of input lag, so not ideal for fast-twitch gaming. But far less lag than interpolation. I'm told by reports, motion blur of this Impulse setting is similar to a plasma.
(This hdtvtest.co.uk review talks about the Motionflow Impulse setting
If you already have the high-end Sony HDTV, try this setting with the game console (temporarily disable Game Mode, enable Motionflow Impulse) and see if it works well with motion blur elimination.
I am wondering if some of the newer Samsungs (Clear Motion Ratio 960) have a similar interpolation-free strobe backlight setting.