15 K probably buys you a good decent one and you can spend extra to make it perfect.
If you have a 30K budget go for a 'perfect' one and then put some goodies on:
LSD
Lightweight wheels
Spacers if necessary
ECU + cold air intake
Exhaust Akrapovic
Have it detailed so it looks brand-new.
Personally I would like the Red Bull edition from 2012, I think it was the last year they made them.