The Agera R from Swedish auto-boffins Koenigsegg is the thinking man's hunk of speeding joy. The engine of the R model runs on biofuel, theoretically allowing you to save the earth while screaming across its surface at a top speed of more than 400kmh. It also does 0-100 in 2.9 seconds. Price Tag: $1.9M. Buy it if: You're want something that'll let Monaco's other summer residents know you're caring for the environment.