Sold in two primary versions -- one without a braided strap ($88), and one with ($108) -- A.B. Sutton's new Sport Slip for iPhone 3G is a playthrough, kidskin leather case that's custom-colored to your personal preferences. You can pick the leather, thread, trim, and lining types from a collection of options, and the case will be handmade to your specifications in 2-3 weeks. Another interesting option is the "Open Port" or "Closed Port" feature, which…