Actually, the C280 is faster than the CLK. But the CLK is brand new so maybe it's just not worn in yet.
As for the Porsche, I don't drive that one much! I have never really cared for Porsches. I know that they are truly great vehicles, but they just aren't to my liking I guess.

And as for SUVs... I don't care for them either. I used to drive the Tahoe before I got the C280, and it'd night and day. I can't even describe the difference. We also have a 1992 Jeep Grand Cherokee, and that's a REAL POS. It's been an OK car... not TOO many problems (3rd trans at 135k miles though!). But the car squeeks and rattles over every bump, every turn, and it's enough to drive you crazy.

I just want a little more oomph in the C280 because it's the car I drive all the time!

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)