I feel like Davey Richards is the main guy they should get signed. He reminds me so much of Benoit. Like Benoit he wasn't the greatest on the mic, but he got his point across. The ring work is very similar, and he is a great worker. He could be billed as "The Relentless" Davey Richards. He likely wouldn't be able to keep the name, but the idea that he is relentless would go well. He brings intensity to his matches.
Mike Bennett would be a great fit in the WWE, he has the look, mic skills and ring skills of a WWE star. If he does get signed he need Brutal Bob and Maria with him. Adam Cole is another name that comes to mind he has been impressive with his PWG World title run, his ROH run is kind of meh but I enjoyed his match with Kyle O'Reilly at BITW 2012, just give him his Panama Playboy gimmick if he gets signed, although I'm afraid they won't let him do that top rope canadian destroyer