Hmm.... well a few just off the top of my head would be:
-Dodge Magnum
-Buick LaCrosse
-Dodge Dakota if trucks count
-Kia Sportage
Jut to name a few. Of course those are all MPO, but I would choose the 300 over any of them.
I also highly doubt that any of the above mentioned vehicles did what the 300 did for there manufacturers.