Three guys jump to mind right away, Mr. Kennedy, MVP and Shelton Benjamin.
Mr. Kennedy has had the worst luck, but he's, as the cliche goes, a main event waiting to happen. He's great as a face and as a heel, he's one of the best in the business, right up there with guys like John Cena and Triple H, in terms of mic skills and he has that rare ability to really engage the crowd. You can see whenever he cuts a promo, regardless of whether it's as a face or as a heel. The crowd just does whatever he wants them to do. He can really funny and serious at the same time and his promos can often be better then some guys matches.
Inside the ring Kennedy is fantastic as well. He's not a brawler or a high flyer but his move-set is exciting and he can set a great tone in a match. Besides, how many guys do you know that can turn a reverse side Russian leg sweep into a really cool finishing move?
I think that MVP is the leading candidate to win the Money in the Bank this year. I'm really liking his current face turn and he's another guy that is absolutely brilliant on the mic. He's very expressive in the ring and on the mic, which as simple as it sounds is a trait that most wrestlers don't have, and he's proven many times now that he's fully capable of working a great program. He's probably the most ready for a main event run. He's done great and long term programs with guys like Kane and his feud with Matt Hardy really brought out the best in both of them and showed that they both have the goods to be the type of guys a company can build around.
MVP's great in the ring and he's a terrific storyteller. I can't wait until he's finally put in the main event title picture.
Benjamin in the obvious answer. It's easy to see that he has true superstar potential. I'm really excited to see his upcoming feuds with Kennedy and MVP. Without a doubt Shelton Benjamin is the best pure athlete in the WWE, if not all of wrestling. He's got a terrific build and he has a rare in-ring ability to pull off memorable moves.
The only reservation I have about Shelton is his mic skills, or lack of skill. WWE keeps putting the mic in his hand, hoping that he'll get better, but I don't know if he will. That's the only, and I mean the only, thing holding him back. I think that he needs a face turn. WWE doesn't let their heels perform exciting moves because the fans would cheer for them so they've had Shelton working more of a ground game, which doesn't really suit him.
Evan Bourne has proved though that you don't need great mic skills to get over with the crowd. Benjamin can perform Bourne-like moves if Vince would let him, and that would be a perfect way to get him over as a credible main event type.