I'm currently looking at options regarding a case or sleeve for the Air I ordered today. Speck's SeeThru shell seems great, but there are lots of reports of cracking and weighing down of the display. Does anyone know if the Air's hinge has been reinforced? Other options are the Speck TrimSleeve, although it's fake leather, and maybe the Nero Envelope, although it seems somewhat gimmicky. There's also Vaja and Joli Originals, although both are a bit pricey. Thoughts?