Boxster: slowest to accelerate but best handling
Z4: faster but not quite as good handling at the limit
SLK: touring car
I want a Boxster to autocross and a Z4 sdrive 28i to drive on the street. I can't do both so I'm looking at a '13 Boxster and an '11 35is. If the Z4 had a factory option LSD it would be no contest.