Porsche 928
The 928 was a Gran Turismo coupe with a powerful V8 engine in the front, a transaxle gearbox, ideal weight distribution, intelligent suspension, and a space-age design. In contrast to the 911, which still had some VW Beetle cues, the 928 looked like it came from another planet. Although the early 928s had below 300 hp, the car was fast, and it was made for effortless cruising. And driving over continents in comfort, speed, and luxury (via Car and Driver).
For decades, this model was in the shadow of the famous 911, but recently people started realizing just how good those coupes are. And, of course, prices started going up.