Just done a check on the DVLA site, road tax for upto 2005 IS200 model is £260 for 12 months , not £445, so that saved you £185 already :winky:
Dammnit! I just bought a pre March 2001 registered IS200 specifically so the tax would be lower. Fail... major fail. :(
Your road tax is £215 for 12 months. Se here:
http://www.direct.gov.uk/en/Motoring/OwningAVehicle/HowToTaxYourVehicle/DG_10012524