1.4 TSi A3? Thats the Turbo/Supercharged jobbie isn't it?
Ah, the great ill-informed breeze through the thread. The Audi 1.4TSi is turbo-charged only. Audi don't use the turbo/super charged version that VW use elsewhere.
Having actually driven a 1.4TSi A3 (and more than just a test-drive-round-the-block; my other half has one as a company car) it's OK. It's no rocketship, but feels fine for everyday driving. There isn't the urge of the 2.0TDi (which she had previously) but in many ways it's more pleasant to drive in a petrol-v-diesel kind of way. We don't get close to the mpg figures though (whereas we did in the TDi). Note that the most recent A3 2.0TDi has vastly reduced CO2 emissions so can have significant benefits now as a company car (so much so that the new 1.6TDi looks kind of redundant).
I don't get on with the driving position in the Jazz, but then I tend to sit in a funny way. The internal flexibility of the Jazz has always really impressed me though. Fiesta is a class smaller but supposed to be a very good car. No idea about the Yeti.