Similarly named to one another and based loosely upon earlier cases, iSkin's Solo FX ($35) and Solo Vu ($40) are nonetheless fairly different designs, each based upon translucent molded TPU plastic. Whereas Solo FX is a single color -- from your choice of several options -- varying in glossy and matte finish based upon the side you're viewing it from and the design of the rear surface, Solo Vu combines colored TPU with a clear hard shell in an ingenious…