Combining leather with either black ballistic nylon or brown canvas in a folio-style design that's becoming increasingly familiar to iPhone users, Incase's new Leather Folio for iPhone ($40) outshines its numerous similar competitors on looks, but is also more expensive. With an isobar/topographic map-styled suede interior and Velcro tabs to hold the lid closed, the Leather Folio features a non-detachable rear clip that mounts iPhone horizontally…