Glad you could discover the power of RAW
Your resultant image is a bit off, I think. The tone curves are a bit messed up.
Try this:
Open the resultant JPEG in Lightroom 2 (your second picture).
Open the Tone Curve Tool on the right.
There are 3 sliders at the bottom of the Histogram.
Slide the dark (left) slider to 10
Keep the middle slider at 50.
Slight the highlight (right) slider to 85.
Now, adjust the Highlights, Lights, Darks, Shadows sliders to these values (you may have to click the tiny black triangle to the very right of the first set of sliders to see these).
Highlights +1
Lights +53
Darks +17
Shadows +14
Hopefully, this should bring your photo's vibrancy back without losing any detail from the passenger. Hope this helps! Monitors vary, though, which may explain the different look we're getting (mine is only "eye calibrated")