Hey Dave, welcome.
At one point, when I was being a total meathead, I was about 230lbs without gear, and so well above that with gear on and my 057 is still new as the day I bought it 4 years ago.
It's my experience, that people are far too concerned about the strength of these frames (or carbon in general). My advice is pick the one you want, do a bit of research, and don't think anymore of it. That said, at that weight I'd definitely pay attention to my seat post and handlebar selections.