If you have 30k, I would recommend (like Waynne said) Toyota Supra Twinturbo, like we all know that supra has six ''power/tuning" stages. Stages are not hard to install (it is following instructions) and The sixth stage makes over 600bhp almost 700, depending how you tune the turbos example.
But other car i would highly recommend is BMW M3, very aggressive car when you listen its motor, or you drive it. Of course M5 or M6 are also available but those are high too expensive.
And ONE car what is inexpensive Is Nissan 200sx/Silvia S14/15, that car has some serious horsepower and is also very goodlooking! (but one warning, Nissans own turboes are bad, they break down easily. I have own experience about those older Silvias)