Hello, My name is Charentin,
I plan to buy a DB9.
Any advice ?
It should be one of the most reliable options out there...if you will be very attentive to the oil system.
Otherwise go for the manual Coupe, the TouchTronic is a fine transmission, but is a compromise. There has been a small issue with the automatic version "park regime", but I think it's been dealt with.
Older cars should be strong so long the oil system is maintained.
I would avoid the Volante version at all cost.
Lastly, waiting for 3 years is the best option for you...
Once they get the DB9 replacement into production, prices will bottom (possibly like the DB7's). I doubt the cosmetic makeover due in 2011 will pull the prices down, so consider waiting a bit.
That is all for now
Good luck!