BMW has officially launched the fourth model in the 1-Series range, the 1-Series Convertible which is expected to go on sale on both sides of the Atlantic in spring 2008. Equipped with an electro hydraulic operated soft top that closes within 22 seconds, the 1-Series Convertible will be available in the US in two guises, the 128i which receives a 3.0-liter, 230 Hp inline six-cylinder engine and