The SLK 350 is about 50K with the options that I want (leather, Sirius, ugraded stereo).
My RX-8 has red/black leather interior with heated seats, Bose sound system and Sirius radio. The rotary engine is really smooth, even at high rpms. It redlines at 9,000 rpm. I just love the howling sound of the rotary engine. There's not much low end torque, so you don't come off the line really fast. But, it has plenty of power and the handling is superb. The car seems to pivot from the center. The list price was 34K and I got it for 28K during 2005 model close out.
When/if this car dies, I may get the SLK. But, we're going to spend about 100K on a lagoon swimming pool and outdoor kitchen. My salary has to pay that off first.