To the OP: Congrats on Trek standing up for you. I don't know whether the damage was actually your fault, Trek's, your LBS's or all of the above, but overall, I think you came out smelling like a rose. If you like the carbon ride, keep with it. Carbon isn't as durable as steel (most nothing else is), but how many times do you expect to have a catastrophic failure like this?
I, personally, am wary of narrow chains (think 9 or 10 speed models) and of ALL Shimano chains. I like Wiperman chains and am particularly fond of their stainless steel ones. I prefer to spend some $$ upgrading my chains so that I don't have to worry about chain failure. I can't say that what I do is a surefire prophylactic, but I've never (yet) had a chain failure.
Glad to hear you weren't seriously injured & I hope you got the cute girl's #!
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Nishiki road bike, Raleigh road bike, Electra Cruiser Lux 7d, Electra Townie 3i, Electra Townie 1, Whatever I find today!