Word is, some dealerships are selling 04s for just inder 31K. Figure 10% for tax and license and you should be out the door for around 34K. From that number, you can calculate your payments using an online payment calculator based on how much you put down or trade, APR and duration of loan.
Some younger drivers at
www.s2ki.com have had as much as $3000/yr or more for full coverage. Married and over 25 it should be half that. Will depend on where you live & driving record too.
I would also add that the cost of owning this car goes a bit beyond that. For example, owning a convertible and not owning a house with a garage (i.e. parking it in the street or an apartment complex garage every night) is asking for trouble.