my first car, a 3 series

[samdale]

ok so im almost 21 (and will be when i buy the car) and want to buy a bmw instead of driving my mums little car which i've been using since i was 17.
im looking to spend around 5k and want to find a car thats reliable.
i am tempted by a 330d performance wise but i fear it might be expensive to run and finding a decent one for my sort of money will be tricky. what other models are good alternatives? what is the 320d like?

[samdale]

not 2 bothered really, can still get decent performance from diesel and not get stung for insurance of a big petrol