My comments on this thread:

1. Everyone is talking about super high end bikes when the OP is focused on entry level. Guys: at $2K max, he's not going to be getting a Neil Pryde or a Storck.

2. Carbon is really, really strong. People think you need to baby it which is a complete misconception. Carbon will not crack just from pedalling hard or from a jarring impact. It will crack if you over tighten a bolt or crash. When talking about normal riding around, no frame material is going to be tougher than carbon. Technically infinite fatigue life. They're building airliner fuselages out of the stuff now guys, it's plenty tough.

3. Lots of 240lbs+ guys on this forum. No value judgement, but every single thread seems to be about a guy who's 6'3", 250lbs. I'm in the land of giants. Also, this is not exactly typical cycling physique so it's probably fair to assume that most very high performance ultra light bikes bikes are not going to be engineered with Paul Bunyan in mind. I wouldn't worry about your frame at this size, I'd worry about wheels. You guys need 32 spokes, IMO.