Tyson Kidd and Kaval are two really great pure wrestlers, as are Jack Swagger and even Chris Jericho to an extent. If you're going for pure mat wrestling ability you have to give it to Swagger. He's the best pure athlete since Benjamin and Kurt Angle, and even though he doesn't get to show it that often, we know the ability is there. It's too bad whiny Mysterio got the title at Fatal 4-Way, I was really enjoying his push...
As for the best overall wrestler in WWE today...that's a harder question to answer. Rey Mysterio has great ability and is over with a certain demographic, but has no mic ability and is losing star power. CM Punk can be really good, but he's just not the best. I really want to say Chris Jericho, because he's got the total package of ability, mic work, star power, and...he's just damn entertaining to watch. If it were still 2008 I would definitely give this one to Jericho, hands down. But since it's now 2010, I'm going to say Randy Orton. He's got great skill, he can pull awesome promos, and his character is flawless. He has that psychotic "viper" persona down to a science, and it's so great to watch.
Now, to settle that whole John Cena thing... He's the company's golden goose. As far as star power, he's the best right now. As far as promos go, he's still probably the best we've got. But Orton and Jericho...and pretty much all of the main eventers beat him in ability (or at least what he's allowed to show). I do like John Cena, but he's not the best overall wrestler in the WWE today. Which is a shame, because if he really let loose and rocked the in-ring talent, he'd be the total package.