i own two bars for my Monocog: the wide, heavy Syncros bars that came with it, and some FSA xc190's. the Syncros bars are about 26.5" wide (670mm) but very heavy. the FSA's are about 25" wide (635mm) and a lot lighter than the Syncros bars, but the narrower width seems to necessitate some bar ends, so i added some stubby ones. i think the bar ends probably negate the weight difference.
your thoughts on wide bars v. narrower bars with bar ends? i am going to experiment with each but wanted to hear some outside experience.