Like Graham says, I've got a Focus Estate, 1.8 Turbo Diesel model.
I know everyone has to consider costs of any car, but I personally want to get from AtoB in some comfort as well. Regularlly travelling 300+mile round trips for a days fishing, I do not want to be doing that in the middle of winter in a car I think may let me down, or where the heater or the wipers don't work.
My Focus is plenty roomy enough for what I need, & economy is much better than my old petrol Escort estate (although could be better if I went a tad slower up & down the M6). I don't know the tech spec, but the ground clearance is fine for wherever I go, provided you don't pretend you're Colin McCrae down every farm track!
Like Paul says, a thief will get into any car if he really wants to. Choose your venue carefully....
Steve.