just a fyi-- vw owns Bentley. the vw phaeton is a d1 platform (steel body). the d1 platform is the vw and the bentley continental. It also shares suspension parts w/ the d3 platform-- which is the audi a8 (all aluminium body)
Sadly, the vw is probably the best used luxury car you could get for under 20k-- even as low as 10k i seen them for.