I'm about to purchase an M3. Is this a good deal?

This is my 1st post. Should I purchase the following? It's a 2001 M3 convertable.
It's low milage with 18,000 miles on it.
Will be under warranty bumper to bumper through 2008.
It's loaded with a navigation system.
I think I can get them down to $40.000. Would you buy it if you were me? Iv'e always wanted an M3. I really want this car.
I plan on buying it, keep it for about 3 or 4 years then trade it on the newer body style M3.

I just ran the car through the Kelley Blue Book private party value check, and a 2001 M3 vert' w/ 18,000 miles in excellent condition should go for $40-$41,000. Sounds like a good buy to me.

Personally I like the Coupe more then the Convertable, and you should be able to get a coupe for less, but if you like it, thats awesome. M3s are great cars.

Thank you. I really appriciate it.