I've been doing a lot of research on bikes and the materials involved, and I see a lot of different carbon fibers being used. FACT, monocoque, bontrager, kinesis...are just three that I can think of off the top of my head but you probably know there are many more. Are these all pretty much the same? Or is a cheaper carbon exactly that - cheap? I've been told that a low-end carbon is no better than aluminum. Are carbon seat stays going to make that big a difference if the longest rides I do are ~175 miles? Thanks!