I think the main problem I have in transitioning to Carbon, besides the cost, is that if I do have a failure it will be catastrophic. At 240-250 lbs I am certainly stressing my frames. But I think you can be selective in the Carbon Frame you choose to go with. A Carbon frame designed for touring would be my first choice for the roads I ride. And I don't do touring. At your height and weight you should consider that your are looking for a sturdy frame with sturdy wheels. Steel, Aluminum, or Carbon that rules out most of the affordable off the shelf bikes for sure...