I have been looking at a 2006 (ish) C320 CDI Auto for a little while now and a low mile example (50,000) goes for around the £6,000 to £7,000 mark.... Whilst looking i have come accross a number of 57 and 08 plated 320 CDI's but with the W204 chassis, they are around the £3,000 mark more than the older chassis but with the same engine and gearbox.... are they that much better ?