ya, having carbon bars is iffy. depending which ones you get they can be good but like Afton said, one crash you might be replacing a new set of bars. most road bars are aluminum with a carbon outer layer, i could be wrong... also, some have flex to them which you do not want. I am about to move back over the a aluminum bar because I cant stand the flex in mine.
get anything above 105, ie: ultegra or dura ace. you can pick up a used rear derailleur off ebay easy and cheap. make sure you get the right speed.
Go with the rear D, dura ace or ultegra like trey said. Agreed.
Carbon bars are just iffy.