£15 car options - what would you choose

[georgefreeman]

So you have £15k to spend on a car, where would you more go?

Only criteria;

Less than £300 road tax
£15k max
2006 or newer
Mpg of circa 30mpg
As little depreciation as possible
Reliable

It can be any number of seats, any drive configuration, but must be used as a daily, roughly 20 mile round trip.

Thanks in advance