Don't forget; if your only reason for riding BarCons is the fear STIs will break somewhere on the back side of the moon, two thoughts spring to mind:
1) in 10,000 miles with them I've never had one break, and
2) if I'm really going so far into the unknown that it's critical, I can carry a DuraAce downtube shifter or two. Pop off the Cable Stop Converter on the side of the broken STI, install DT shifter in its place, trim cable length down to fit, begin using broken STI as brake lever only. The DT shifters probably weigh five ounces and take up 2 cubic inches of space. Problem solved.
So, if your prefer STI shifting, it's not worth settling for BarCons for the supposed greater reliability.