For visceral experience, the F430 Scud - with the air intakes right behind your head, the sound was just freakin' awesome.
For pure driving fun, I haven't spend enough time in the 570S to form a proper opinion, so at this point my favorite to is the GT3. The more exotic cars are great, but they tend more towards comfort and showiness than actual driving dynamics. As I tell my customers, Porsche is a sports car manufacturer, and the GT3 is the car that they build as a weekend track toy; it's the sharpest tool in that box IMHO.
At the other extreme, the Gallardo is living proof that Lamborghini started out manufacturing tractors. 😀