Lamborghini roadsters are among the most desirable on Earth and the Murcielago LP640 roadster is the king of them all.   The reason why lies underneath the hood where a 640 HP V12 powers the roadster to 62mph in 3.4 seconds and keeps going all the way up to 205 MPH.  The LP640 also features exterior changes to set it a part including a new rear diffuser integrated with the exhaust pipe and differently styled tail lights.   It also shares the same modified front bumper as the LP640 coupe.