quickest i've driven is prob my Fiat, but maybe just cos i drove it quicker? had a go in a mates sapphire cosworth but it didnt feel that quick but i wasnt ragging it.
most scary to drive is my brothers 3.5 v8 rover engined hilux, with different carbs on and straight through exhausts, if you thrash it you can spin the wheels into 3rd, and the tyres are 44inches, and about a foot wide i think! lol
but it had no power steering when he first got it and it was more like it was driving you when you floored it!