I can't believe that I am forgetting probably the best overall balls to da wallz track car ever: The Caterham Seven Superlight R500:
At £32,000, this car packs a punch. 230 HP, 460kg weight, 0-100-0 in 11.44 seconds, 0-60 in 3.4 seconds, 6 speed sequential gearbox, just pure track attack machine! The only downside to this compared to other sports cars is the top speed of 150mph.