"... Taurus can't offer a V8 ..."
That's funny, I drove one with a 4.4 lt v8 in it.
Even though it is basically a Volvo platform with Ford skin on it, it is an interesting car and shows that Ford may have another good car on their hands to sell. I think the v8 was an overkill, but it was a test vehicle ... sort of and it is hoped that the option comes available for this market.
Between the 500 and the Taurus, there are 500 changes made to the skin and interior of the car, amazing that "500" pops up a lot.If you want a better car, get a Volvo by the way but if you want a Ford, get a Ford.
The re-badging was due to a market study that Ford did in 2006/7, they found the slumping sales of the 500 was due to the lack of name recognition, where the Taurus had all the hype when it came out in the 80's and it was embedded in the minds of many of the present buyers.
It is a lot like the reasoning behind MKX opposed to the Mark X (ten), they did a study a while back that showed that the average Lincoln buyer didn't know much about the history of the Mark series and couldn't understand roman numerals - I'm not kidding.
by the way, somewhere in Germany there is a McClaren Mercedes used as a high speed pursuit car. Nothing like a $500,000 car as a police car.