what's a fast / reliable car that i can get for $16,000?

i am looking for something that is fast and reliable for 16k..
17k max
i love sports cars, i was looking at the Nissan 350z, the Mazda RX-8, the Mazda 6, scion Tc and the list goes on forever...

but which one is really the best?!?!
tell me your personal option about which one is faster and better..

thank you..
 
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