Nowdays I think I'm more of a steel guy. I used to drool carbon and still sometimes do ( especially tri bikes) but I like the idea of making frames myself. I'm also intrigued about the utilitarian side of steel (slap the racy frame full of eylets and you have yourself a nice touring rig)

Of course you can make carbon bikes yourself too but the amount of engineering that goes into carbon (use of different CF types to optimize handling and feel) is so huge that it just would not be the same. But I am planning on making some carbon rims at some point since they are relatively simple to fabricate. Maybe even a disc wheel at some point (not so easy though...)