The 2.2 has around 170 BHP, and it depends on what you want regarding performance. For some tastes it is adequate, for others not enough! The 6-cylinder unit is quite reliable, but only has the 5-speed box and no sport button. The 2.5 pre-facelift does have a sport button and 5 5-speed box, the 3.0 has a six-speed box. The 6-cylinder facelift cars have the N52 engine, again a reliable unit, and an electric water pump, which does cost a few pounds to replace. You have to test drive the 2.2 to see if it is suitable for you. Take your time!