Replying to First car; suggestions?!

I'm 17, and have been saving up for a car. I would like something nice, my cap is like $15,000 and looking for a car with around 70,000 miles if not lower. Two cars in mind...

Used 2011 Subaru Impreza WRX hatch, 30,000 miles, around the &15,000 range(don't remember exactly)
Fully loaded, leather seats, sunroof, nav.
Or

Used 2007 BMW 335ix, (awd obviously) 4 door, around 70,000 miles, and right at $15,000. Nice car but no nav.

Which is a better choice ?

Other suggestions