There are actually a couple of Aston Martin four seaters: First of all, there is the Rapide, which hasn't yet been released, but will be by the end of the year - it is a dedicated four seater, with four doors. There is also the DB9 coupe (not the convertible "Volante"), which although only has two doors, has four seats. Just don't expect the rear seats to be accomodating.
In other brands, don't overlook the Ferrari 612 Scaglietti, which is very desirable, but the looks of it are up to personal taste. My favourite, and much cheaper four seater car that is still outstandingly desirably - the Maserati GranTurismo. ICarScan
will actually seat 4 in comfort, despite being a coupe, and it's the only thing that looks anywhere near as good as the Aston Martin DB9.