99 Merc S420 (80k Mi) 07 Lexus LS460 (21k Miles)
If you are looking to lower your payments then stick with your Mazda. When you factor in the continuing repair costs associated with a low quality C class (02 was a VERY bad year for the C), shop time billed at $80-150/hour, and just plain bad build quality, you will be very disappointed with the car. The Mazda3 is a good car for the price. Stay with it. Its no less than 10 times more reliable then an 02 krapressor.