Here is a cool application for a covered porch if you want something a little different. Corrugated metal roofing with the exposed rafters. It could turn into a love/hate thing too depending on where you live and how you use it. I'm referring to rain. It can get loud so get ready. It comes new but you can easily find some great salvaged materials if you want a little more of a rustic look. They also did a nice custom job with the gutters in this photo. It's a nice touch, but not necessary. Again, it's about making it work for you and how you want to utilize the space.
photo via Design Studio Modern