You won't want to use motion smoothing with video games on an LED, DanBook, because they introduce too much input lag. That's the unfortunate nature of the beast. As someone who has always played games on LEDs, your eyes just get used to the inherent motion blur. But it might be a shock coming from a plasma.
However, LEDs tend to hide the effect that you're seeing due to that motion blur. Plasmas produce what's described as frame doubling if the game's performance is a little slow. Since our current generation of consoles are very long in the tooth, a lot of games for them aren't running anywhere close to 60 FPS, the optimal performance for a plasma. The new systems coming out this holiday will run games better for awhile, but when they start to age you'll start seeing developers cut back on the frame rate in order to push out more pretty visuals. And then you're back to square one.
There's unfortunately no perfect television yet. I would take your game console to the store and ask them if you can hook it up and test it out on some LEDs. Make sure to disable their motion processing (Samsung's Auto Motion Plus, Sony's MotionFlow, LG's TruMotion, etc.) when you do so in order to keep the input lag down.
As far as which manufacturers offer the best processing, Sony and Samsung both hold that honor. You may want to consider the Sony W900A as a possible choice. Its Triluminos display has great colors (and an expanded range for content that supports it) and very low input lag. You can use the MotionFlow Impulse setting with video games for a blur-free image, but it dims the image considerably and causes flicker. It and the F8000 are pretty on par in most areas, though, with the F8000 pulling ahead in terms of 3D, physical aesthetics and its smart TV platform. The F8000's input lag is a little higher, but I think you'd be hard pressed to notice the difference.
If you want to gold wild, you could always pick up a 55" LED and
a DLP projector!