Stems- carbon or aluminum?

[fourflys]

so I will probably eventually go to a 40cm bar on my Anderson from the 42 currently on there.. probably go with a carbon bar (maybe Specialized) due to trying to cut down on road buzz (I think that makes sense, right?)..

so, the question is if there is any reason to get a carbon stem other than cool points? bike has external routing, so no need for fanciness there.. would a carbon stem make enough of a difference vs the increased price?

Additionally, what are folk's thoughts on using a set of bars with a little bit of flair on a road bike?

did a search on here and Google (searching "Paceline forum") and found nothing of consequence..