What's your "benchmark" car?

I don't know about you guys, but I use the E92 M3 as a performance benchmark (numbers-wise.) It is reasonably quick, but not too insanely fast. When I see numbers for a new car, I always think, "oh, that's xxxx faster/slower than the M3” or "That has xxxx more/less horsepower than the M3.” Do you guys have a "performance benchmark?"