Get the TL. It's a sporty luxury sedan, with good power, Acura reliability, and great looks. My cousin has a 6 speed 07 TL and loves the car, and the only change that he would make is to get a Type S (turbo). The RDX is an ok car, but for a first car, especially since you're young, I would go for the sportier sedan, even though the insurance may be more expensive.