Jem- Those early DBS cars had the classic A-M DOHC straight 6 of the DB2-6 series, plus wire wheels, and that may be why there is interest.
Hi Taz, on the DBS the point I was trying to make was that the 6 cylinder DBS was, logically, the flawed version. It only existed becasue the V8 engine wasn't ready and got pasted in the press of the time for being slower than the DB6. The V8 DBS got great reviews by contrast even though it was too heavy for wire wheels.
Therefore, if the V8 is more drivable but the DBS 6 is more collectable, the market is more about emotion and perception, rather than which is mechanically better - there is another thread about the 355 being worse than the 360 mechanically but prettier and therefore will rise in value. Not being able to apply logic makes 'investing' in the cars very hard and you have to not worry about driving the car but other factors. This perhaps makes it more like the market for art.
For me personally, I can't get past the better to drive bit even though the DBS 6 looks better on wires.
...The number of people turning to more analogue cars with a clutch and gearshift will only turn more people on to the car. After all the good press it's surprising people have not seen what great value it is before now.
Matt, the 550 is fantastic and links to my point above about great to drive. The friends I have with 550s love them and love them more the more they drive them.
In the UK the 550 seems to be almost at parity to the 575 F1.
e.g. 31K miles 1999 550 advertised at £59K vs, a 33K miles 2004 575F1 at £60K. The only differences is the manual 575, there is a manual 575 for sale in the UK, 30K miles 2003 575 manual but at £75K. £16K uplift on 575 vs 550 seems too much of a difference to me under normal road driving.