 Saab 9-5 2.8T aero ?38,585  Saab's recent history has been uninspiring to say the least. It's a long time since it made a truly competitive car, a fact that loyal fans blame on the way the Swedish manufacturer was run by General Motors. There's a certain irony, then, in the fact that the company's best car in two decades has arrived just as control has passed to Spyker.  When The Sunday Times tested a 9-5 diesel last year it was clear that it couldn't compete with the best of audi and BMW. But this top-of-therange 2.8T aero is a different story altogether.  The super-smooth 296bhp twin-turbo V6 motor works in perfect harmony with a slick, six-speed automatic gearbox, directing power to all four corners of the car so effectively that perhaps the worst rainstorm I've encountered in Britain could not throw it off its stride. Some of you will be old enough to remember when Saabs felt like impregnable fo 