If TNA could get any one from the WWE who would it be and why?

For TNA to snatch someone from the WWE, they would grab a high-card preformer, not a mid card like so many people are stating. TNA wants to pull more attraction from the WWE fan base in order to get more attention nationally, even world wide. For this to happen, they would need to have a better choice of wrestlers with high card capabilities, and even though a push for Matt Hardy would be nice to see, it would simply not happen in TNA. For them to grab someone from WWE, TNA would pull from the likes of Rey Mysterio, HBK, Undertaker, or even Chris Benoit since they are well known and have a fan base that is spread throughout the world.