My wife's lease on her '07 Infiniti M45 is going to be done in a few months, so I'm starting to look for another car for her. She's after something luxurious and sporty, and we're going for something under $50k and under $40k if we could. The SL500 is just too slow and the 550 is a little pricey. We've been checking '08 M3's, '05 Maserati QP's, and 06, 07 Cayman S's. What do you think about these cars and does anyone have any other suggestions. The QP looks good, but how is it on maintenance and reliability?