Ferrari 360 Spider with F1 Shift - Great power and handling but gearbox is awful (buy the manual not the F1)
Lamborgini Diablo (Audified one!) - Even better power, handling ok but felt a bit like a small bus to drive it since its so big. Drove it in London, definately not practical!
Porsche Boxster S - Hired one in Las Vegas, nice car but crappy brakes (almost went through the first set of traffic lights I got to) - could be something to do with American roads though - it was squealing tyres a lot like all cars in America.
Jaguar X-Type 3.0 - Hired one last weeked while my car is away, really hated it! Although it is supposed to be a young exec type car like the IS200 the handling was nowhere near as good. Overall power was better but the auto gear box made it feel very laggy like a badly turbo charged car.
Lotus Exige with manufacturers 190HP kit - Great handling, very quick but hard work because everything is manual (no power steering, power brakes etc.), would be great as a second car for fun but don't have one on its own!