At one point in my life, I was asking the same question.
M3, M5 or 911........I went for the 911
They are both completely different cars, all depends on what your priorities are.
The M5 would be a more practical daily driver.
The 911 has a very firm and hard ride, don't know if you'll enjoy that everyday, especially if you drive in the city with bad roads.
I assume maintenance cost would be about the same, both are equally expensive! The 911 might just be a little more costly to own.
The 911 does get more mpg though...average 19-26mpg, compared to the 11-15mpg for the V10 M5 (13-21mpg for the V8).
Whichever one you get, I'm sure you'll have no regrets! Good Luck!
Last edited by CosmosBlack; 10-06-2008 at 01:30 AM.