20. Pontiac GTO (2004-2006)
The Pontiac GTO (2004-2006) was initially overlooked due to its understated appearance, but its potent LS V8 engine and relative rarity have earned it new respect among enthusiasts.
Today, prices are climbing toward $30,000 as collectors recognize its blend of performance and sleeper appeal.
For more on its rising status, check MotorTrend’s GTO Buyer’s Guide.