I made a list about this a while back....
1. Spider-Man (just because)
2. GL
3. Flash (think of what you could do)
4. The Doctor (high-level reality warping, and he's constantly reincarnated with memories of his past, so I'd never really die)
5. He-Man....strong, but only as much as needed, so you wouldn't have to constantly be careful.
6. Plastic Man
7. Longshot (luck powers = sweet)
8. ...um...I forgot.
Purple Man is a great choice too. 😈
Favorite male heroes: Venom, Spider-man, T-bird, Namor, Daredevil, Marv, Wolverine, Darkness, Batman, Green Arrow
Favorite female heroes: Black Canary, Witchblade, Scream, She-Venom, Storm, Phoenix, Vixen, Black Cat, Elektra, Miho
As for powers a symbiote (i.e. Venom) or lycanthropy / animalistic or feral powers (Vixen, Wolfsbane, certain versions of the Black Cat) would be cool.
I'd get tired of being Hulk....you'd break everything in the real world and would have to be too careful. And you'd rip so many pairs of pants it wouldn't even be funny...his pruple ones always staying on is pure PIS after all. Same with most herald-level people. With their powers, that is, not the pants.
Also, I'm surprised no one's said something like "TOAA" or Franklin or something. Personally I wouldn't mind being, say, Galactus....respect and fear on a universal scale can't be a bad thing... 😛