Cadillac Eldorado
In the 1990s, the Eldorado was probably one of the most understated luxury performance cars on the road. The car shared almost all its underpinnings with the STS, which is relatively unknown to most consumers. The suspension on the touring model was geared toward long drives with lots of twists and turns (via Hemmings).
The Eldorado models from the 1990s were comfortable cars with great interiors and excellent performance. The Northstar V8 was a bulletproof power plant as long as you kept the oil changed on time and the maintenance up to date.