2006 Cadillac DTS Performance 4dr Sedan (4.6L 8cyl 4A)
Love almost everything about the Cadillac DTS, except the floor mats. It is one of the most comfortable cars I have ever driven and it has power to spare. The only complaint I have, besides the floor mats, is that a five or six speed transmission would be a welcome improvement.
The ease of use of the navigation system.
Add a six speed transmission. Also, give it floor mats that are Cadillac quality.