I would recommend a 115bhp TDCI focus Zetec, I had 5 foci, 2 115 TDCI's where great, nice sporty suspension, 45mpg and go well, group 5 insurance.
The ST170 I had was crap, crashy ride, it bottomed out on roads you could tear down in the TDCI and 25-30mpg. The petrol focus is hard to run if the anual mileage is high.