It's about time some one made a zero offset carbon post that's reasonably light, reasonably stiff and easy to mount for $100.00.  I use zero offset posts on both my road bikes and tri bikes and I prefer carbon to aluminum.  The Winwood post is full carbon with a carbon/aluminum clamp and weighs in at well under 200 grams.  While the mounting system is not my favorite, it only takes about 5 minutes or so to mount your saddle and once mounted, you can easily alter its position.  The Winwood post has a good looking matte carbon finish and fits snuggly in your 27.2 seattube.  Only sizes available are 27.2 x 250 or 350.