Sold separately or as a set, Uzibull's new Ekto2 case ($40) and Flex system ($75) give iPad 2 users a variety of options for protecting and carrying their tablets. Ekto2 is an unusually thick silicone case that can be used alone on the iPad 2, protecting its most fragile edges with a substantial quantity of rubber. The Flex set includes an Ekto2, and adds a hard plastic frame and collection of attachments. When put together on an iPad 2, Flex provides…