The Countach has always been my favorite Lambo, even if its unfortunate name has way too much innuendo potential. My personaly favorite would be this baby:
Hennessey Venom 1000 Twin Turbo
However, I'd have it painted in House of Kolor Cinnamon Pearl with a single broad stripe down the center (
like this) in HOK Ketchme Kopper Pearl. I'd also switch the standard six-speed stick shifter for a paddle shifter.