After whetting our appetite at CES, Samsung's updated Series 7 Chronos is slowly squeaking its way into US retailers. Spotted at Best Buy for $1,200, this 21mm dynamo packs a 2.4GHz Intel Core i7 3635QM CPU and an AMD Radeon HD 8870M GPU along with a 15.6-inch touchscreen. While this lean, mean, Windows 8 machine's streamlined design and spec sheet are impressive, such adornment comes at a price. Absent from the Chronos' fine engineering is room for an opti