Man, I would absolutely love to see what Marvel could do with at least Dr. Doom - what an awesome villain. I'd only be into Silver Surfer if he was played by Joe Satriani
Anyway, back on topic. Those pics I made of Aaron Paul were done on request - I think Paul is far too weird looking to play a typical super hero. I think he'd be best as a side-kick, if anything - there are a few pictures of him as Robin that I've seen and liked. I hate to typecast, but Paul is kind of an ultimate sidekick character actor - I'd take him as Robin, or Eddie Dean, and I loved him as Jesse (obviously). But as someone like the Flash? No thanks.
For Flash, I think it would be hard to beat the following 3 guys: Ryan Kwanten, Chris Pine, or Ryan Gosling. Given that Gosling would almost never accept the role, that leaves Chris Pine and Kwanten. Chris Pine would be great for the action and charismatic for the role, but the guy I want to see is Kwanten. He's the sort of guy I think that wouldn't look down his nose at playing The Flash- he's hungry for good roles, and I think he'd nail it and have a lot of fun that the audience could resonate with. I'm personally not a huge Flash fan by any stretch (I've never read a single Flash standalone comic), but if I heard Kwanten were cast, that would get me really amped up.
Here's my take of Kwanten in the costume:
Pretty epic to me. Easy to see Chris Pine in it too, but Kwanten is the one that would get me excited. He's just always fun to watch.