The F430 is what I'd chose. Great performance, with the chains, low maintenance, and very, very quick, with good reliability. The Enzos, F40, etc., are all too low to be usable, great track cars though. Art
I know this isn't fair but-- the first car that came to mind was the 250 California spider SWB (probably the nicest proportions and purposeful design inside and out I've ever seen) but then it was the 275gtb (just pure downright sex on wheels) then the lusso, (the perfect blend of elegance and speed) then the 312 F1 car that I saw in Grand Prix as a kid. (That movie hooked on the prancing horse like it was crack.) In the "daily driver" category, who can blame anyone for wanting to be Tom Selleck in Hawaii driving in a red 308 gtsi Quattrovalve? But, the 250 California Spider SWB would be my choice if I had to choose only one. Great design, great engine, great lineage, and looks that have never been beaten but often copied.
410 SuperAmerica. Vintage V-12, beautifully styled, big enough to be a GT but fast enough to be fun. Pure class.
This is hard.... so many Ferrari's to choose from, so many good ones. I'd have to say an F355 GTS in TDF Blue, Nero Seats with TDF Blue stitching. I'd die a happy man.