"There are amongst us those who believe that small is better. That little something with the bulk engineered out of it must be necessarily be more highly evolved - phones, gadgets, television presenters. When it comes to cars, it should be relatively simple. Small cars have space only for small engines. And small engines, as we all know, mean small power. However small can also mean nimble; there is simply less of the car to change direction, so it can do so more quickly. But here's your chance to decide for yourself, with some small cars with enough power to make them a lot more than merely entertaining. The Fiesta ST is one of the very best - as befits a car that's coompeted on the World Rally Championship, as of course has the Citroën DS3. Though the Citroën, like the Fiat Abarth 500 es