it's all about DEMAND.. and demand for 330 is low because of the higher road tax..325 commands a higher price because of demand.. even a recond unregistered '02/03 330ci cabrio i guess would only fetch 130-150 now.. most of them at the showroom has been there for quite a while ,unable to find new homes...hence getting cheaper.. road tax is about Rm1400+ vs 325's RM600+.. and also if usage is for urban driving mostly,then Fuel consumption is higher for 330 . But then again it is a great engine with the added OOMPH.. if $$ is not a major consideration as compared to enjoyment and satisfaction , then go for it.. it being cheaper , i guess offsets the higher road tax paid for it..it's only about 800+ difference plus I guess an extra 3-400 for urban driving extra fuel expenditure..BUT u get the satisfaction! A 330Ci I guess would be around 110-130k now ,second hand.