I've bought 2005 Kia Optima EX V6 from a private seller as a used car for my high school son. This is a hidden jewel! Fast, tight, luxurious, reliable, etc. I'm more than 100% satisfied with this car. I think that Kia (and Hyundai) is under estimated than its real value. It's good factor to consumers though.
Smooth engine, sportronic gear, comfort, reliable, moon roof, Infinity audio, automatic air quality control system, etc.