Fiats are as fast as required imo, they have enough juice to take on most of the general public.
It's always nice to have a Focus ST for example, but as said earlier when buying my car i looked at tax / insurance / fuel costs and you save a fortune with a fiat.
Besides, if I wanted to go quickly id buy a motorbike... would smoke any of the above with ease for half the price & half the costs, yeah maybe a little closer to death but if your after some fun why go half way... and the only person you'll be killing is yourself. (well, in most cases.)
That's the way i see it, id love a motorbike though... hmm, maybe.
^ that is all