I have never driven an 911, but I do dream that one day I will order one brand new. I say this sitting at my desk looking at 911's online. I do this every so often, and then I go get in my BoxS and for some reason I stop wanting a 911.
I absolutely love the BoxS. It is so incredibly fun to drive.
Is the 911 worth the extra $15k? Sitting at my desk I tend to say yes, but once I'm driving around in my BoxS it is a much more difficult question to answer.
And BTW, I totally agree with "iflyadesk" regarding stats. Numbers on a sheet won't tell you the whole story. They are useful for people who want to get into a pissing contest about who's car is better. Recently I had someone on another board try to start crap with me about an EVO vs a BoxS. His quote was "an EVO would own a BoxS." Then the numbers started flying.
I don't care about the numbers. I care about how the car makes me feel when driving.
One day I will take a spirited drive in a 911, but until then I'm quite happy to tear about in my BoxS.