[mechanicalbrain]

I think my personal favorite is a carbon/Kevlar composite plain weave with a heavy duty epoxy. Yes you do have to form it yourself but its actually pretty easy and not horribly expensive. The shaping is actually good because you can customize the shape of the frame without having to lose strength. Also It has a good strength to weight ratio (the exact ratio escapes me).

Also one critical thing Ive failed to see mentioned are the types of strength materials have . A materials type of strength defines its function. The Kevlar gives a great tensile strength and torsional strength. Yet the carbon gives the weave good transverse strength and amazing impact resistance. However I recommend practicing the process and familiarizing yourself with the materials. If you don't form it evenly or use the right types of epoxy and weave you will create weak points.