Id go for the cheap diesel option. Or if you want petrol then a Honda 1.5 civic is always a good option. Just save up a bit of money and then have a look.
If you were going with the finance option, the bigger the deposit the less youd pay on finance.
So save up a grand and then once youve done that youd be able to say "oh theres this car available for 1K" or "I could put 1K deposit down on this other car"
I dont know anyone who would disagree with DEViANCE about depreciation, have a look at Audi A8s on autotrader. Older ones can be boughts from around £3500. When they were new youd look at atleast 10x more.
like this one:
http://cgi.ebay.co.uk/CHEAP-1999-T-Reg-Audi-A8-2-8-Auto_W0QQitemZ260261526863QQihZ016QQcategoryZ9835QQssPageNameZWDVWQQrdZ1QQcmdZViewItemOnly 9 yrs old, 11K a year on the clock. So not greatly used and it looks in good nick. Id buy it too if I had 4K. But in reality Ive done only a few miles on the motorway this year and dont need a big car. Id go with a Pug 306 TD. Spend about £1000, maybe a bit more and get one that hasnt been owned by a boy racer, even if its cheaper than another one.