I've had a GTP and 2 SSEi'*. The GTP was quick, light, and powerful enough for my needs. It was a great family car and at the time fit the budget. If your looking for raw unadulterated power, it can be had with the GTP or even Regal GS. If your looking for good power with a little more luxury look at the Bonneville, or Park Avenues. If your looking for high end luxury then your going to pay for it in the form of BMW and Lexus and Mercedes.
This has been stated before, but just because you have one bad experienace in a car does mean the entire model, line, or company is bad.
Yep, it all boils dont to the previous owner of the car. How they treated it when they previously owned the car only matter.