Well if speed and only speed is the criteria, this American built UK based company Ariel's Atom V8 limited customized edition (25) is top of the pops. The chassis is visible, there are no doors, no roof and definetely no extra comfort features. The speed can make the driver look like an alien as seen on Jeremy's drive on Topgear. Atom V8's specs are impressive 3 L V8, 500 bhp, race car acceleration fastest seen on production car. Basic Atom 3's base price is $ 50,000 and this limited superversion is rumored to be at $ 160,000.