The carbon fibre front lower fascia splitter does look vulnerable and expensive to replace.
I have never read about any sort of height adjustable front suspension option on any of the DB9 series > Astons, the Vanquish does have an adaptive rate shock absorber setup as standard , but nothing that is capable of raising the front ride height from inside the car.
It doesn't look as low as some of the mid engine supercars in the front though, so you could probably get away without such a device (unless you have to regularly negotiate a particularly steep angled driveway)