Unless you're a professional cyclist, the few grams difference in weight carbon bars will make is insignificantAluminum bars are fine.
I've been racing with FSA K-wings for about a year now and I went down recently hard in a crit and they didn't break but they did get ground down on the side but nothing seriousI won't be going back to Aluminium anytime soon.
George Hincapie uses aluminumSo did LanceFor me, no real reason to go to carbonI'm sure they're strong, but a fracture of carbon could be fatal! Like Lance, I use the good-ol' standard dropNo anatomic bendsThis actually allows for a more aero-position because you actually do get lower in the drops (same reasoning as Lance used)It's pure preference, howeverI'm not aware of any standard drop based on width.
