My 1st car was a lupo 1.4tdi. Now there good cars to remap and for insurance. 1st Year driving and was only £1500, with mum and dad on of course. Had that car for 2years and upgraded to a Audi S3 2000reg, remaped that and insurance was only 1500again with mum and dad on. Had them on untill this year. 21now and there starting to make in more expensive. lol. Bought my self a Cupra Tdi. Fantastic car, not as luxury as s3. nor as quick but i bet it isn't far off. but a hell of alot cheaper to run, not putting 60quid a week in anymore. only 20quid. although insurance is more on the cupra for some unknown reason which i must admitt leaves me confused.
Haven't sold it yet either, waiting for private plate to come off of it before i do.
But i'd always go for a turbo diesel unless your alot older, earn a lot more than i do, and want something that's insanly fast!!