I bought my 2005 RX-8 about a week ago, switching from my Audi A4. I never intended to buy the car, but my girlfriend was buying a Mazda 3, and I figured I'd give the 8 a spin while I was at the dealership. Hands-down, it's the most fun car I've ever driven. It's light and agile, rockets you faster to 60 than an s2000, and has incredibly good looks. The rotary engine has a beautiful powerband (and sound), and the 9,000 rpm redline is unbelievable! The four-door functionality is definitely a deal-clincher, as it makes this beast actually practical. My only gripe is the mpg which seems like it should be higher for the size of the engine. But if mpg is what I wanted, I'd have bought a Civic.
Handling, suicide doors, acceleration.
Forced induction, improved gas mileage, iPod connectivity.