Now that case designers have had the opportunity to refine their earliest designs using actual iPad hardware, we're starting to see more interesting and polished options: Incipio's new NGP Matte ($40) is a prime example. Though the case is conceptually similar to its earlier silicone rubber Dermashot designs, NGP Matte uses tightly molded TPU plastic to produce a sturdier, thinner frame that is pliable enough to easily place on the iPad, yet firm…