So, it's basically who is going to take it from SS or Atom? Well, I guess it has to be SS then. Unless Captain Atom has done things I have never heard nor read about, there is no way he can take someone as powerful and versatile as the Silver Surfer.
docfatalis- Well I'm not so sure about that. It's going to be difficult since BM has limited appearances and a lot of what Sentry has done has been with abilities he doesn't have in this thread, but an argument could probably be made for either. Same thing with SS and CA. I'm not that familiar with CA, but some people are under the impression he can beat SS. This appears to be a pretty even fight that would be a good debater's battle.