Wow, Gumdrop Cases actually went there: Surf Convertible ($45) is a straight-out clone of Apple's official iPad Case, made from a nicer material -- suede-finished faux leather -- and available in three colors rather than just one. Losing only Apple's internal iPad-sealing flap, Surf Convertible preserves the fold-back functionality of the front lid, enabling this case to double as a video and keyboard stand as needed. The look and feel are nicer than…