Caterham 7. I still lust after one of these little beauties....I was suprised to how much fun you could have in one.
Another amazing car for the sheer pulling power was a single turbo Supra with 450bhp+ when I was a teen....back then, that thing utterly scared the living crap out of me. I should have framed the underwear!
Bias opinions below:
350z GT4 (previous car) for the noise that thing made, I remember the first time I took it out with the windows down and I couldn't stop grinning.
Z4m - (current) - for the top down pleasures it brings me
, truly a remarkable car and I still don't think I have touched the surface!