Peugeot 306 1.9D or turbo diesel. Ford Mondeo 1.8TD. Ford Ka. Anything with a volvo badge.
I had a Saab 900 Turbo when i was 18 with 1ncb and it was cheaper to insure than the 1.1 fiesta it replaced. That's going back some years though now.
Older fiestas are good cars, for that matter. Avoid anything with a "fast car" badge like GTi, RS, etc
Dunno about the insurance now but E30 BMW 325i estate was cheap when i had one (again, years ago),they're AWESOME cars. luxurious, reliable, and a superb motorway stormer. Loads of space in the back for girls and beers etc, fairly simple to keep running, and you can get parts.