2009 Mercedes-Benz C-Class C300 Sport 4MATIC 4dr Sedan AWD (3.0L 6cyl 7A)
I just turned in my 2007 Acura TL. I loved that car, it had great styling, performance, and gas mileage (in the last two regards, it still beats my new Benz). But as far as refinement is concerned it's not even close, the MB blows away the Acura. I test-drove a TSX and couldn't believe how much cheaper it felt than the Benz (despite the difference in price, my best Benz lease deal is only $14 more per month than my best TSX offer).
Very refined driving experience; excellent ride, noise suppression, solid-feeling car. Great styling. Very reasonably priced. Base stereo sounds great (plays mp3s); didn't need GPS, saw no need to go with expensive multimedia package.
Disappointing trunk space, fold down rear seats available only with expensive options package. Gas mileage and throttle responsiveness should be better. Why can't I use COMAND screen for iPod interface? Too early to judge reliability at this point but keeping fingers crossed (it's only a lease).