For novelty, the BF Injection. Along with the Nagasaki Blazer and the Dune Buggy, I just love going off-road, especially cutting over mountains. And with the front/rear fender bars? (pardon my car ignorance) the Injection can take a bit of a beating, at least with head-ons and rear-endings.
Among the phallus substitutes, I like the Infernus (mostly because of the rear design with the exhaust backfire), followed by the Coil Voltic. Both feel great to me at high speeds.