Why make the difficult decision between buying a Porsche and picking up a supercar that accelerates so quickly it'll make you bleed from the eyes when you can do both with the 918 Spyder. It only went into production in September, so you'll be cooler than every other kid in the neighbourhood too. At least, all the ones with Porsches. Price tag: $815 000. Buy it if: Your current Porsches just don't excite you anymore.