I like the heel HHH idea . However, I don't like him being a part of Nexus because Nexus sucks and that crap needs to be done with right now. Also, I'd like to see Cena be "heel" (if that's what you can call it) by teaming up with Nexus. Since Nexus sucks, adding Cena will only end it quicker. Vince's attempt to make Nexus serious has turned into a desperate mess of confusion. Just scrap it and move on. We have Bret back so now involve him as GM and just focus on Randy's push.
The WWE needs another push on Randy Orton like a women's rights council needs advice from President Ahmadinejad of Iran.
Orton is by far one of the worst personalities that I can think of in recent memory. This may just be my humble opinion, but I've had a hard time buying into anything Orton has done since joining the WWE. It usually looks like whomever he's feuding with has to carry to feud. About the only upside to Orton angling with Sheamus is that it's a new feud.
Additionally, with regard to the thread subject, the only storyline, to me, that makes sense, is Bret Hart. Bret, since rejoining the WWE, has gone on record as saying that they had something big planned, but that he didn't want to spoil it. I cannot imagine that his bullshit street brawl with Vince was something "he didn't want to ruin." There's no other possible storyline that could developed OTHER than him beating Vince's ass.
Bret is not in a physical state such that he would be able to compete regularly. He was barely able to sell the Street Fight at WM as it was. He couldn't even run to the ring with the rest of Cena's Brigade. I'm thinking that, while he might have wanted to compete, he's not going to be able to compete. Having someone like Bret Hart in charge of Nexus in no way, shape, or form detracts from what they've been doing on their own. It adds to the storyline because of Bret's longstanding feud with Vince. Also, people have a really short term memory. Many of the WWE's younger fans will know WHO Bret is/was, but they're too young to remember any of his story-lines.
Lastly, I would also like to bring up that by having Bret in charge of Nexus, you can accomplish several things;
-You can control the creative writing with regard to Nexus. Bret is enough of a big name and has been screwed over enough by the company that people would overlook his attacks on Cena if they wanted to make the Nexus Tweeners or Faces. Bret has a backstory that would allow people to "sympathize" with his reasons for attacking everyone in the WWE. No other superstar can pull this off.
-Let's be real, if you remove Bret from the 7, a third of Cena's Brigade is heel, Cena is the super-face, and the other three are mid-carders that nobody would give a shit about if Bret turned on them at SS and revealed himself to be Nexus' leader. It would be massively easy to control the direction of this story line from any angle.
-You don't have to end the "anonymous" GM storyline. This allows ample opportunity to bring someone else in to play any sort of GM role, be heel, face, tweener. It's all right there for creative.
-As people have already mentioned, it's going to be impossible to keep up Nexus for a sustained period of time and having Bret in charge of them makes sense for this because I don't think he plans to remain with the WWE on a permanent basis for a sustained period of time. This is the perfect man to lead a fly-by-night storyline for several months.
-Bret is the right amount of superstar and, at the same time, irrelevant enough to be a manager of Nexus. His name won't overshadow the Nexus name, but it's big enough to turn some heads. Bret wouldn't need to do much mic work because he's just the silent leader, and he has Wade who can do that just fine.
-Bret's story fits what Nexus is pushing.
All in all, Bret makes the most amount of sense from any way you look at it IF they're going to create a Nexus leader at all.