Get Natal for only 199$, if you want optional 1080p@60Fps in games. It`s the only way.
Though, if Natal will cost 99$, then i think every x360 owner will upgrade to it.
In this case, in 2011 we are going to see not only just 1080p@60Fps but instead improved textures and other stuff(in exclusives).
But, what about 6GB DVD space limit?