Anyone clear up how much the roadtax is on the xf's, on the autotrader ads they mostly all say £405/435 for the year but then a few websites (link below) say that older models are about half that

Chrysler Crossfire Coupé (03-08) Road Tax Prices

Seeing as I'll be looking at getting an 03/53 04/54 plate I'll be happier with cheaper tax....please tell me it is so