This is kind of off-topic, just offering it simply for info - in AU the bulk of the extra cost in the V8 is due to several extra options being standard. When I was buying my 3.0sd I worked out that if you deducted the cost of the things which are standard on the V8 but are optional on all the other models here, there's only a couple of thousand dollars difference.

Similarly, once I'd specced up my 3.0sd with a bunch of goodies, it came out very close in price to a V8 specced up the same way.